SB20260831111 - Ubuntu update for webkit2gtk
Published: August 31, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 47 vulnerabilities.
1) Memory corruption (CVE-ID: CVE-2026-28953)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted website and perform an unexpected process crash.
2) Improper access control (CVE-ID: CVE-2026-43705)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to bypass security restrictions.
The vulnerability exists due to improper access control in WebKit when rendering content. A remote attacker can craft malicious web content to bypass security restrictions.
3) Improper access control (CVE-ID: CVE-2026-43701)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to improper access control in WebKit when rendering content. A local user can trigger the vulnerable WebKit behavior to escalate privileges on the system.
4) Use after free (CVE-ID: CVE-2026-43699)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected process crash.
5) Memory corruption (CVE-ID: CVE-2026-43676)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected Safari crash.
6) Memory corruption (CVE-ID: CVE-2026-43663)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected process crash.
7) Protection Mechanism Failure (CVE-ID: CVE-2026-43660)
CWE-ID: CWE-693 - Protection Mechanism Failure
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to prevent CSP enforcement.
The vulnerability exists due to insufficient implementation of security measures in WebKit. A remote attacker can trick the victim into visiting a specially crafted website and prevent Content Security Policy from being enforced.
8) Memory corruption (CVE-ID: CVE-2026-43658)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted website and perform an unexpected Safari crash.
9) Memory corruption (CVE-ID: CVE-2026-39872)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected process crash.
10) Memory corruption (CVE-ID: CVE-2026-28984)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected Safari crash.
11) Exposure of sensitive information to an unauthorized actor (CVE-ID: CVE-2026-28958)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local application to gain access to sensitive information.
The vulnerability exists due to excessive data output in WebKit. A local application can access sensitive user data.
12) Memory corruption (CVE-ID: CVE-2026-28955)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted website and perform an unexpected process crash.
13) Memory corruption (CVE-ID: CVE-2026-43707)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected process crash.
14) Use after free (CVE-ID: CVE-2026-28947)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error in WebKit. A remote attacker can trick the victim into opening a specially crafted website and perform an unexpected Safari crash.
15) Use after free (CVE-ID: CVE-2026-28946)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error in WebKit. A remote attacker can trick the victim into opening a specially crafted website and perform an unexpected Safari crash.
16) Use after free (CVE-ID: CVE-2026-28942)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error in WebKit. A remote attacker can trick the victim into opening a specially crafted website and perform an unexpected Safari crash.
17) Protection Mechanism Failure (CVE-ID: CVE-2026-28907)
CWE-ID: CWE-693 - Protection Mechanism Failure
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to prevent CSP enforcement.
The vulnerability exists due to insufficient implementation of security measures in WebKit. A remote attacker can trick the victim into visiting a specially crafted website and prevent Content Security Policy from being enforced.
18) Memory corruption (CVE-ID: CVE-2026-28905)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted website and perform an unexpected process crash.
19) Memory corruption (CVE-ID: CVE-2026-28904)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted website and perform an unexpected process crash.
20) Memory corruption (CVE-ID: CVE-2026-28903)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted website and perform an unexpected process crash.
21) Memory corruption (CVE-ID: CVE-2026-28902)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted website and perform an unexpected process crash.
22) Memory corruption (CVE-ID: CVE-2026-28901)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted website and perform an unexpected process crash.
23) Use after free (CVE-ID: CVE-2026-28883)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error in WebKit. A remote attacker can trick the victim into opening a specially crafted website and perform an unexpected process crash.
24) Memory corruption (CVE-ID: CVE-2026-28847)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted website and perform an unexpected process crash.
CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to incorrect handling of path names in WebKit. A local user can trick the victim into opening a specially crafted file and gain access to sensitive information.
26) Use-after-free (CVE-ID: CVE-2026-64783)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to use-after-free in WebKit when processing maliciously crafted web content. A remote attacker can send maliciously crafted web content to cause a denial of service.
User interaction is required to process the crafted web content.
27) Buffer overflow (CVE-ID: CVE-2026-64757)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to memory corruption in WebKit when processing maliciously crafted web content. A remote attacker can send maliciously crafted web content to cause a denial of service.
User interaction is required to process the crafted web content.
28) Spoofing attack (CVE-ID: CVE-2026-64730)
CWE-ID: CWE-451 - User Interface (UI) Misrepresentation of Critical Information (Clickjacking, spoofing)
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform ui spoofing.
The vulnerability exists due to improper UI handling in WebKit when visiting a website that frames malicious content. A remote attacker can frame malicious content to perform ui spoofing.
User interaction is required to visit a website that frames malicious content.
29) Improper access control (CVE-ID: CVE-2026-64728)
CWE-ID: CWE-284 - Improper Access Control
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to violate iframe sandboxing policy.
The vulnerability exists due to improper access control in WebKit when processing maliciously crafted web content. A remote attacker can send maliciously crafted web content to violate iframe sandboxing policy.
30) Out-of-bounds write (CVE-ID: CVE-2026-64719)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to out-of-bounds access in WebRTC when processing maliciously crafted web content. A remote attacker can send maliciously crafted web content to cause a denial of service.
User interaction is required to process the crafted web content.
31) Information disclosure (CVE-ID: CVE-2026-64713)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to determine whether the user has visited a given link.
The vulnerability exists due to insufficient checks in WebKit when rendering web content. A remote attacker can host malicious web content to determine whether the user has visited a given link.
32) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-43804)
CWE-ID: CWE-664 - Improper control of a resource through its lifetime
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper state management in WebKit when visiting a website. A remote attacker can host a crafted website to cause a denial of service.
User interaction is required to visit the website.
33) Out-of-bounds write (CVE-ID: CVE-2026-43745)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an out-of-bounds write in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected Safari crash.
34) Use after free (CVE-ID: CVE-2026-43742)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected process crash.
35) Memory corruption (CVE-ID: CVE-2026-43740)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and gain access to sensitive information.
36) Use after free (CVE-ID: CVE-2026-43734)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected process crash.
37) Use-after-free (CVE-ID: CVE-2026-64787)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to crash the browser.
The vulnerability exists due to a use-after-free error when processing untrusted web content in WebKit. A remote attacker can trick the victim into visiting a malicious website and crash the browser.
38) Use-after-free (CVE-ID: CVE-2026-43731)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to use-after-free in WebKit when rendering web content. A remote attacker can trick the victim into opening a crafted webpage to execute arbitrary code.
39) Use after free (CVE-ID: CVE-2026-43727)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected Safari crash.
40) Use after free (CVE-ID: CVE-2026-43726)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected process crash.
41) Improper input validation (CVE-ID: CVE-2026-43725)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to improper input validation in WebKit when rendering content. A local user can trigger the vulnerable behavior to escalate privileges on the system.
42) Improper input validation (CVE-ID: CVE-2026-43721)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:/VI:/VA:/SC:N/SI:N/SA:N]
43) Use after free (CVE-ID: CVE-2026-43720)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a use-after-free error in WebKit Canvas. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected Safari crash.
44) Memory corruption (CVE-ID: CVE-2026-43716)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected Safari crash.
45) Use-after-free (CVE-ID: CVE-2026-43715)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to use-after-free in WebKit when rendering content. A remote attacker can craft malicious web content to execute arbitrary code.
46) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2026-43713)
CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls
CVSSv4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N]
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to improperly imposed security restrictions in WebKit. A remote attacker can trick the victim into visiting a specially crafted website and gain access to sensitive information.
47) Memory corruption (CVE-ID: CVE-2026-43712)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected process crash.
Remediation
Install update from vendor's website.