SB2026072442 - Debian update for firefox-esr

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB2026072442

SB2026072442 - Debian update for firefox-esr

Published: July 24, 2026

Security Bulletin ID SB2026072442
CSH Severity
High
Patch available
YES
Number of vulnerabilities 32
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

High 53% Medium 44% Low 3%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 32 vulnerabilities.


1) Incorrect calculation (CVE-ID: CVE-2026-16363)

CWE-ID: CWE-682 - Incorrect Calculation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to JIT miscompilation in the JavaScript: WebAssembly component when compiling and executing WebAssembly content. A remote attacker can supply crafted WebAssembly content to execute arbitrary code.


2) Buffer overflow (CVE-ID: CVE-2026-16412)

CWE-ID: CWE-119 - Memory corruption

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to memory corruption in multiple components when processing crafted content. A remote attacker can trigger memory corruption using crafted content to execute arbitrary code.

Mozilla reported that some of the underlying bugs showed evidence of memory corruption.


3) Information disclosure (CVE-ID: CVE-2026-16405)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: 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/E:U/U:Clear


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an information disclosure flaw in the Networking: WebSockets component when handling WebSocket connections. A remote attacker can trigger crafted WebSocket behavior to disclose sensitive information.


4) Improper privilege management (CVE-ID: CVE-2026-16396)

CWE-ID: CWE-269 - Improper Privilege Management

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote user to escalate privileges.

The vulnerability exists due to improper access control in WebExtensions when using extension functionality. A remote user can abuse extension functionality to escalate privileges.

Exploitation requires the use of WebExtensions.


5) Information disclosure (CVE-ID: CVE-2026-16391)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an information disclosure flaw in the Storage: IndexedDB component when handling stored web data. A remote attacker can trigger crafted storage interactions to disclose sensitive information.


6) Protection mechanism failure (CVE-ID: CVE-2026-16390)

CWE-ID: CWE-693 - Protection Mechanism Failure

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to bypass a security restriction.

The vulnerability exists due to a mitigation bypass in the Enterprise Policies component when applying enterprise policies. A remote attacker can trigger crafted policy conditions to bypass a security restriction.


7) Protection mechanism failure (CVE-ID: CVE-2026-16387)

CWE-ID: CWE-693 - Protection Mechanism Failure

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to bypass site isolation.

The vulnerability exists due to a site isolation issue in the Networking component when handling network operations. A remote attacker can trigger crafted network behavior to bypass site isolation.


8) Protection mechanism failure (CVE-ID: CVE-2026-16383)

CWE-ID: CWE-693 - Protection Mechanism Failure

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to bypass a security restriction.

The vulnerability exists due to a mitigation bypass in the DOM: Networking component when handling network operations. A remote attacker can trigger crafted network behavior to bypass a security restriction.


9) Improper access control (CVE-ID: CVE-2026-16381)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to bypass the same-origin policy.

The vulnerability exists due to improper access control in the Networking: DNS component when resolving DNS requests. A remote attacker can trigger crafted DNS behavior to bypass the same-origin policy.


10) Improper privilege management (CVE-ID: CVE-2026-16379)

CWE-ID: CWE-269 - Improper Privilege Management

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to escalate privileges.

The vulnerability exists due to improper access control in the DOM: Content Processes component when handling content processes. A remote attacker can trigger crafted content process behavior to escalate privileges.


11) Protection mechanism failure (CVE-ID: CVE-2026-16377)

CWE-ID: CWE-693 - Protection Mechanism Failure

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to bypass a security restriction.

The vulnerability exists due to a mitigation bypass in the PDF Viewer component when rendering PDF content. A remote attacker can supply crafted PDF content to bypass a security restriction.


12) Protection mechanism failure (CVE-ID: CVE-2026-16375)

CWE-ID: CWE-693 - Protection Mechanism Failure

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to bypass site isolation.

The vulnerability exists due to a site isolation issue in the Networking: HTTP component when handling HTTP traffic. A remote attacker can trigger crafted HTTP behavior to bypass site isolation.


13) Information disclosure (CVE-ID: CVE-2026-16374)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an information disclosure flaw in the Framework component in DevTools when using developer tools functionality. A remote attacker can trigger the flaw through crafted developer tools interactions to disclose sensitive information.


14) Improper privilege management (CVE-ID: CVE-2026-16371)

CWE-ID: CWE-269 - Improper Privilege Management

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to escalate privileges.

The vulnerability exists due to improper access control in the DOM: Navigation component when handling navigation operations. A remote attacker can trigger crafted navigation behavior to escalate privileges.


15) Integer overflow (CVE-ID: CVE-2026-16369)

CWE-ID: CWE-190 - Integer overflow

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to integer overflow in the JavaScript: WebAssembly component when compiling or executing WebAssembly content. A remote attacker can supply crafted WebAssembly content to execute arbitrary code.


16) Out-of-bounds read (CVE-ID: CVE-2026-16368)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to incorrect boundary conditions in the JavaScript: WebAssembly component when compiling or executing WebAssembly content. A remote attacker can supply crafted WebAssembly content to cause a denial of service.


17) Access of Uninitialized Pointer (CVE-ID: CVE-2026-15718)

CWE-ID: CWE-824 - Access of Uninitialized Pointer

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to an invalid pointer in the JavaScript: WebAssembly component when processing web content. A remote attacker can trigger the vulnerable component to execute arbitrary code.



18) Use-after-free (CVE-ID: CVE-2026-16362)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to use-after-free in the WebRTC: Audio/Video component when processing real-time audio or video content. A remote attacker can trigger the flaw using crafted real-time media interactions to execute arbitrary code.


19) Buffer overflow (CVE-ID: CVE-2026-16361)

CWE-ID: CWE-119 - Memory corruption

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to memory corruption in multiple components when processing web content. A remote attacker can convince the victim to visit a specially crafted website or URL to execute arbitrary code.

Some of the underlying bugs showed evidence of memory corruption.


20) Buffer overflow (CVE-ID: CVE-2026-16360)

CWE-ID: CWE-119 - Memory corruption

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to memory corruption in multiple components when processing web content. A remote attacker can convince the victim to visit a specially crafted website or URL to execute arbitrary code.

Some of the underlying bugs showed evidence of memory corruption.


21) Input validation error (CVE-ID: CVE-2026-16359)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service or execute arbitrary code.

The vulnerability exists due to incorrect boundary conditions in the Audio/Video: GMP component when processing media content. A remote attacker can convince the victim to visit a specially crafted website or URL to cause a denial of service or execute arbitrary code.


22) Improper access control (CVE-ID: CVE-2026-16358)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to bypass site isolation.

The vulnerability exists due to a site isolation issue in the Graphics: WebRender component when rendering content. A remote attacker can convince the victim to visit a specially crafted website or URL to bypass site isolation.


23) Input validation error (CVE-ID: CVE-2026-16357)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service or execute arbitrary code.

The vulnerability exists due to incorrect boundary conditions in the Graphics component when processing rendered content. A remote attacker can convince the victim to visit a specially crafted website or URL to cause a denial of service or execute arbitrary code.


24) Use-after-free (CVE-ID: CVE-2026-16356)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to escape the sandbox.

The vulnerability exists due to use-after-free in the Disability Access APIs component when interacting with accessibility functionality. A remote attacker can convince the victim to visit a specially crafted website or URL to escape the sandbox.


25) Incorrect calculation (CVE-ID: CVE-2026-16355)

CWE-ID: CWE-682 - Incorrect Calculation

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to JIT miscompilation in the JavaScript Engine: JIT component when executing script content. A remote attacker can convince the victim to visit a specially crafted website or URL to execute arbitrary code.


26) Information disclosure (CVE-ID: CVE-2026-16354)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to improper access control in the Graphics: ImageLib component when processing image content. A remote attacker can convince the victim to visit a specially crafted website or URL to disclose sensitive information.


27) NULL pointer dereference (CVE-ID: CVE-2026-16353)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service or execute arbitrary code.

The vulnerability exists due to an invalid pointer in the DOM: Bindings (WebIDL) component when processing web content. A remote attacker can convince the victim to visit a specially crafted website or URL to cause a denial of service or execute arbitrary code.


28) Use-after-free (CVE-ID: CVE-2026-16352)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to escape the sandbox.

The vulnerability exists due to use-after-free in the Disability Access APIs component when interacting with accessibility functionality. A remote attacker can convince the victim to visit a specially crafted website or URL to escape the sandbox.


29) Use-after-free (CVE-ID: CVE-2026-16351)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to escape the sandbox.

The vulnerability exists due to use-after-free in the DOM: Navigation component when handling navigation. A remote attacker can convince the victim to visit a specially crafted website or URL to escape the sandbox.


30) Input validation error (CVE-ID: CVE-2026-16350)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service or execute arbitrary code.

The vulnerability exists due to incorrect boundary conditions in the Audio/Video: cubeb component when processing media content. A remote attacker can convince the victim to visit a specially crafted website or URL to cause a denial of service or execute arbitrary code.


31) Improper access control (CVE-ID: CVE-2026-16349)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to bypass the same-origin policy.

The vulnerability exists due to improper access control in the DOM: Navigation component when handling navigation. A remote attacker can convince the victim to visit a specially crafted website or URL to bypass the same-origin policy.


32) Improper access control (CVE-ID: CVE-2026-15719)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber


The vulnerability allows a remote attacker to manipulate DOM elements.

The vulnerability exists due to improper access restrictions within the Navigation component. A remote attacker can trick the victim into visiting a specially crafted website and manipulate arbitrary DOM object, bypassing site isolation in DOM.


Remediation

Install update from vendor's website.

References