Description

Privilege escalation due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "8.8",
  "pubDate": "2026-09-29T13:17:43.137Z",
  "pubdate": "2026-09-29T13:17:43.137Z",
  "executiveSummary": "This vulnerability involves a privilege escalation flaw within the Graphics component of the Firefox browser, stemming from incorrect boundary condition handling.\nThe flaw allows an attacker to bypass security constraints to elevate privileges within the context of the application.\nAffected products include Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.\nThe risk implication is significant, as successful exploitation could enable unauthorized system access or arbitrary code execution with the permissions of the browser process.\nExploitation generally requires the attacker to influence the rendering pipeline via malicious web content or a crafted document, potentially leading to a compromise of the sandbox integrity.",
  "technicalDetails": "The root cause of this vulnerability is improper validation of boundary conditions within the Graphics component's memory management or rendering logic. When processing complex graphical data, the component fails to enforce strict bounds checking, leading to potential buffer overflows or out-of-bounds memory access.\nAttack flow typically begins when a user navigates to a malicious webpage or interacts with specially crafted graphical content designed to trigger the boundary condition error. The malicious input is passed into the browser's graphics rendering pipeline, which performs operations without adequate checks on the input size or memory offsets.\nBy providing malformed parameters, an attacker can induce an out-of-bounds write or read operation. A carefully crafted payload can overwrite adjacent memory structures, such as function pointers or sensitive object metadata, effectively hijacking the control flow of the browser process.\nBecause the Graphics component operates within a privileged or semi-privileged layer, bypassing boundary checks allows an attacker to break out of restricted execution environments. Once memory safety is compromised, the attacker can achieve privilege escalation, allowing the injected code to execute with the full security context of the Firefox application.\nThe vulnerability is inherent to the logic handling within the Graphics component. Systems using versions prior to Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17 are susceptible. Exploitation is usually performed without the need for manual authentication by the user, as the interaction is triggered through standard browser navigation. Post-exploitation impact may include unauthorized data exfiltration, system persistence, or the execution of arbitrary payloads on the host operating system."
}