Description
Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Published: 2026-09-29
Score: n/a
EPSS: n/a
KEV: No
Impact: Sandbox Escape
Action: Patch Now
AI Analysis

Impact

This vulnerability is a sandbox escape in Mozilla Firefox's Graphics: WebRender component caused by incorrect boundary checks. An attacker could trigger it by supplying malicious graphic content, allowing code execution with the privileges of the browser process.

Affected Systems

All Firefox users running versions earlier than Firefox 157, Firefox ESR 115.42, Firefox ESR 140.17, or Firefox ESR 153.4 are affected. This includes every operating system supported by those releases.

Risk and Exploitability

No EPSS data is available and the vulnerability is not listed in the CISA KEV catalog. Exploitation would require loading crafted graphics into the browser; once triggered, the sandbox escape could lead to arbitrary code execution.

Generated by OpenCVE AI on September 29, 2026 at 17:17 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade to Firefox 157 or newer, or to any newer ESR release (115.42, 140.17, or 153.4).
  • If updating is not immediately possible, disable the WebRender engine by setting the preference dom.webrender.enabled to false in about:config.
  • Consider running Firefox inside a sandboxed container to contain any potential exploitation.

Generated by OpenCVE AI on September 29, 2026 at 17:17 UTC.

Tracking

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Advisories

No advisories yet.

History

Tue, 29 Sep 2026 17:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-119

Tue, 29 Sep 2026 16:45:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Vendors & Products Mozilla
Mozilla firefox

Tue, 29 Sep 2026 13:15:00 +0000

Type Values Removed Values Added
Description Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Title Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component
References

Subscriptions

Mozilla Firefox
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-09-29T12:36:07.342Z

Reserved: 2026-09-26T19:16:55.886Z

Link: CVE-2026-100781

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-29T13:17:43.023

Modified: 2026-09-29T13:17:43.023

Link: CVE-2026-100781

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-29T17:30:17Z

Weaknesses
  • CWE-119

    Improper Restriction of Operations within the Bounds of a Memory Buffer