SB20260824312 - Debian update for webkit2gtk
Published: August 24, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 vulnerabilities.
1) 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.
2) 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.
3) 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.
4) 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.
5) 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.
6) 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.
7) 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.
Remediation
Install update from vendor's website.