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Mozilla Firefox EUVDEUVD-2026-46193

| CVE-2026-16352 CRITICAL
Use After Free (CWE-416)
2026-07-21 mozilla GHSA-cpfr-cvmp-53mx
Information Disclosure Use After Free Memory Corruption Red Hat Mozilla
9.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

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

Sandbox escape crosses a trust boundary (S:C) but realistically needs a victim to load malicious content (UI:R) plus non-trivial UAF grooming and a chained content-process foothold (AC:H).

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:P/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
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Jul 22, 2026 - 17:15 vuln.today
CVSS changed
Jul 22, 2026 - 16:22 NVD
9.8 (CRITICAL)
CVE Published
Jul 21, 2026 - 12:37 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:37 cve.org
CRITICAL 9.8

DescriptionCVE.org

Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, and Firefox ESR 140.13.

AnalysisAI

Sandbox escape in Mozilla Firefox stems from a use-after-free in the Disability Access (accessibility) APIs, letting an attacker who already controls a sandboxed content process break out of the browser sandbox and compromise the host. It affects Firefox before 153 and the ESR 115.x and 140.x branches, with high impact to confidentiality, integrity, and availability. There is no public exploit identified at time of analysis, and the EPSS score is low (0.15%, 5th percentile), indicating no observed widespread exploitation.

Technical ContextAI

The flaw is a CWE-416 use-after-free in Firefox's accessibility subsystem (the 'Disability Access APIs' that expose the DOM/UI tree to assistive technologies such as screen readers). A use-after-free occurs when memory is freed while a dangling reference remains, allowing an attacker to reallocate that memory with controlled data and hijack subsequent object or vtable usage. Because the accessibility layer bridges the sandboxed content process with more privileged browser components, corrupting these objects provides a path across the sandbox boundary. The affected CPE is cpe:2.3:a:mozilla:firefox with all versions prior to the fixed releases; the tags (Memory Corruption, Use After Free, Information Disclosure) corroborate the memory-safety root cause.

RemediationAI

Vendor-released patch: upgrade to Firefox 153, Firefox ESR 115.38, or Firefox ESR 140.13, matching whichever channel is deployed. These are the exact fixed versions cited by Mozilla in advisories mfsa2026-68, mfsa2026-69, and mfsa2026-70 (see https://www.mozilla.org/security/advisories/mfsa2026-68/ and the -69/-70 advisories). Because Firefox ships automatic updates, verify that managed or enterprise policies (policies.json or GPO) have not disabled auto-update and force the update across the fleet. No official standalone workaround is published; as an interim compensating control on systems that do not rely on assistive technology, disabling the accessibility service (setting accessibility.force_disabled to 1) reduces exposure of the vulnerable Disability Access APIs, but this trade-off breaks screen readers and other assistive tooling and must not be applied to users who depend on them.

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Same weakness CWE-416 – Use After Free

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected

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EUVD-2026-46193 vulnerability details – vuln.today
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