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Mozilla Firefox CVE-2026-16362

| EUVDEUVD-2026-46191 HIGH
Use After Free (CWE-416)
2026-07-21 mozilla GHSA-4wj3-8493-w74m
Information Disclosure Use After Free Memory Corruption Red Hat Mozilla
8.8
CVSS 3.1 · Vendor: mozilla
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Severity by source

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

Network-delivered browser UAF, low complexity, no auth, but requires the victim to load content and engage WebRTC (UI:R); memory corruption yields high C/I/A within the browser process (S:U).

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Jul 22, 2026 - 19:36 vuln.today
CVSS changed
Jul 22, 2026 - 18:22 NVD
8.8 (HIGH)
CVE Published
Jul 21, 2026 - 12:37 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 21, 2026 - 12:37 cve.org
HIGH 8.8

DescriptionCVE.org

Use-after-free in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.

AnalysisAI

Use-after-free in the WebRTC Audio/Video component of Mozilla Firefox allows a remote attacker to corrupt memory and potentially achieve arbitrary code execution when a victim visits a malicious page or joins a crafted WebRTC session. All Firefox builds prior to 153 and ESR builds prior to 140.13 are affected, with high impact to confidentiality, integrity and availability. There is no public exploit identified at time of analysis and the EPSS probability is low (0.15%), but browser memory-corruption bugs of this class are historically attractive exploitation targets.

Technical ContextAI

The flaw is a CWE-416 use-after-free within Firefox's WebRTC real-time audio/video subsystem, which handles peer-to-peer media streams (getUserMedia, RTCPeerConnection, media codecs and the SRTP/ICE pipeline). Use-after-free occurs when the media stack continues to reference a heap object after it has been freed - commonly triggered during renegotiation, track teardown, or codec/state transitions in the audio/video path - allowing an attacker to reclaim the freed allocation with controlled data. The affected CPE is cpe:2.3:a:mozilla:firefox (all versions before the fixed releases). Because WebRTC processing runs in the content/media context of the browser, successful reclamation of the dangling pointer can lead to information disclosure or memory corruption escalating toward code execution within the browser process sandbox.

RemediationAI

Vendor-released patch: Firefox 153 and Firefox ESR 140.13 - upgrade to these or later builds as the primary and complete fix, per Mozilla advisories MFSA2026-68 and MFSA2026-70. For managed fleets, push the update through your enterprise policy channel (ESR is the recommended track for organizations needing extended support) and verify the deployed version. As an interim compensating control where patching cannot be completed immediately, restrict or disable WebRTC media access (for example set media.peerconnection.enabled to false in about:config or via enterprise policy) to remove the vulnerable audio/video code path; the trade-off is that this breaks browser-based voice/video conferencing and any site relying on RTCPeerConnection. Additionally, discourage users from visiting untrusted sites or accepting unsolicited WebRTC calls until updated. Confirm patch status against https://bugzilla.mozilla.org/show_bug.cgi?id=2043188.

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Same technique Information Disclosure

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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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CVE-2026-16362 vulnerability details – vuln.today
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