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CVE-2026-92035 Mozilla CVE debrief

A critical vulnerability, CVE-2026-92035, was found in the Graphics component due to incorrect boundary conditions, leading to a sandbox escape. This issue was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3. The CVSS score is 9.6, indicating a high severity level. The vulnerability allows for a sandbox escape, which can have significant operational impacts. Defenders should assess exposure and prioritize patching to prevent potential exploitation. The CVE record and NVD entry provide details on the vulnerability, its CVSS score, and affected products. Mozilla's security advisories (MFSA2026-90, MFSA2026-93, MFSA2026-94, MFSA2026-96) offer additional

Vendor
Mozilla
Product
Firefox
CVSS
CRITICAL 9.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-15
Original CVE updated
2026-09-21
Advisory published
2026-09-15
Advisory updated
2026-09-21

Who should care

Defenders responsible for managing Firefox, Firefox ESR, Thunderbird, and Thunderbird deployments should assess exposure and prioritize patching to prevent potential sandbox escapes.

Why it matters

CVE-2026-92035 is a critical vulnerability in the Graphics component that allows for sandbox escapes. Defenders should prioritize patching affected versions of Firefox, Firefox ESR, Thunderbird, and Thunderbird to prevent potential exploitation.

  • Verify and apply patches to prevent sandbox escapes
  • Assess exposure of Firefox, Firefox ESR, Thunderbird, and Thunderbird deployments
  • Prioritize patching based on CVSS score and affected versions
  • Monitor for potential exploitation attempts

Technical summary

The CVE-2026-92035 vulnerability is caused by incorrect boundary conditions in the Graphics component, allowing for a sandbox escape. The CVSS score of 9.6 indicates a high severity level. Fixes are available in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3. The vulnerability can be exploited to escape the sandbox, potentially leading to arbitrary code execution. Defenders should prioritize patching affected versions of Firefox, Firefox ESR, Thunderbird, and Thunderbird to prevent potential exploitation. The CVE record and NVD entry provide details on the vulnerability, its CVSS score, and affected products. Mozilla's security advisories offer additional information on the fixes and

Defensive priority

Defenders should prioritize patching Firefox, Firefox ESR, Thunderbird, and Thunderbird to prevent potential sandbox escapes.

Recommended defensive actions

  • Patch Firefox to version 156 or later
  • Patch Firefox ESR to version 153.3 or later
  • Patch Thunderbird to version 156 or later
  • Patch Thunderbird to version 153.3 or later
  • Verify inventory for affected versions and prioritize patching

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, its CVSS score, and affected products. Mozilla's security advisories (MFSA2026-90, MFSA2026-93, MFSA2026-94, MFSA2026-96) offer additional information on the fixes and affected versions.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-92035 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-92035

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-92035 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-92035

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.