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Mozilla Firefox CVE-2026-16367

| EUVDEUVD-2026-46200 CRITICAL
Buffer Overflow (CWE-119)
2026-07-21 mozilla GHSA-856j-8v8v-wvfq
Buffer Overflow Red Hat Mozilla
10.0
CVSS 3.1 · Vendor: mozilla
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Severity by source

Vendor (mozilla) PRIMARY
10.0 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
vuln.today AI
8.3 HIGH

Sandbox escape delivered via malicious web content, so AV:N/UI:R and AC:H (requires chaining a memory-corruption primitive); scope changes across the sandbox boundary (S:C) with full parent-process impact.

3.1 AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
SUSE
CRITICAL
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (mozilla).

CVSS VectorVendor: mozilla

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Jul 22, 2026 - 17:09 vuln.today
CVSS changed
Jul 22, 2026 - 16:22 NVD
10.0 (CRITICAL)
CVE Published
Jul 21, 2026 - 12:37 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:37 cve.org
CRITICAL 10.0

DescriptionCVE.org

Sandbox escape due to invalid pointer in the Disability Access APIs component. This vulnerability was fixed in Firefox 153.

AnalysisAI

Sandbox escape in Mozilla Firefox before version 153 stems from an invalid pointer (CWE-119 memory-safety error) in the Disability Access (accessibility) APIs component, letting an attacker who can execute code in a constrained content process break out of the browser sandbox and reach the more privileged parent process with full confidentiality, integrity, and availability impact (CVSS 10.0, scope-changed). No public exploit identified at time of analysis, and the EPSS probability is low (0.14%, 4th percentile), indicating no evidence of widespread exploitation despite the maximum CVSS score.

Technical ContextAI

The flaw lives in Firefox's Disability Access (accessibility/a11y) subsystem, which exposes assistive-technology interfaces used by screen readers and other tools to introspect page and UI structure. CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) combined with the 'Buffer Overflow' tag and the 'invalid pointer' description points to a memory-safety defect - a dangling or malformed pointer dereference in native (C/C++) accessibility code. Because accessibility bridges the sandboxed content process and the trusted parent/UI process, corrupting memory here provides a path across the sandbox boundary, which is why the CVSS scope is Changed (S:C). Affected component is the Firefox desktop browser engine (cpe:2.3:a:mozilla:firefox), and Mozilla tracks it as MFSA2026-68 / bug 2050627.

RemediationAI

Vendor-released patch: Firefox 153 - upgrade all Firefox desktop installations to version 153 or later, which is the definitive fix per Mozilla advisory MFSA2026-68 (https://www.mozilla.org/security/advisories/mfsa2026-68/; tracking bug https://bugzilla.mozilla.org/show_bug.cgi?id=2050627). Because Firefox auto-updates, ensure the update channel is not blocked and force a restart to apply the new build; in managed environments push the update via your software-distribution tooling and confirm version reporting. No official workaround is published; if immediate patching is impossible, compensating controls include restricting or disabling browser accessibility integration where operationally acceptable (this breaks screen readers and assistive technology and does not guarantee the code path is unreachable), and reducing exposure by limiting untrusted web browsing on sensitive hosts - neither is a substitute for upgrading to 153.

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Same weakness CWE-119 – Buffer Overflow

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Same technique Buffer Overflow

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected

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CVE-2026-16367 vulnerability details – vuln.today
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