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Mozilla Firefox CVE-2026-12319

| EUVDEUVD-2026-37110 MEDIUM
Uncontrolled Resource Consumption (CWE-400)
2026-06-16 mozilla GHSA-992q-w5xv-32hh
Denial Of Service Red Hat Mozilla Suse
Medium
Disputed · 6.5 Vendor: mozilla
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Severity by source

Sources disagree (Low–Critical)
Vendor (mozilla) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

AV:N and PR:N apply since any remote unauthenticated attacker can serve malicious media; UI:R is mandatory as the victim must visit the page; A:H reflects browser crash with no confidentiality or integrity impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
3.4 LOW
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: mozilla

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

Lifecycle Timeline

3
Analysis Generated
Jun 16, 2026 - 15:48 vuln.today
CVSS changed
Jun 16, 2026 - 15:22 NVD
6.5 (MEDIUM)
CVE Published
Jun 16, 2026 - 11:52 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Denial-of-service in the Audio/Video: Playback component. This vulnerability was fixed in Firefox 152.

AnalysisAI

Denial-of-service in Mozilla Firefox's Audio/Video Playback component allows a remote attacker to crash or render the browser unresponsive by delivering crafted media content to a victim. All Firefox releases prior to version 152 are affected per CPE coverage. No public exploit has been identified at time of analysis, and SSVC rates exploitation as none with partial technical impact, placing this in the moderate-priority tier rather than an emergency response category.

Technical ContextAI

The vulnerability resides in Firefox's Audio/Video Playback subsystem and is classified as CWE-400 (Uncontrolled Resource Consumption). This root cause class arises when an application fails to enforce limits on resource allocation - such as memory, threads, or CPU time - during input processing. In a media playback context, this typically involves malformed or adversarially crafted audio/video streams that trigger unbounded resource consumption in the browser's media pipeline, ultimately causing process exhaustion or a crash. The affected product is identified by CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*, covering all Firefox versions across platforms prior to the fix.

RemediationAI

The vendor-released patch is Firefox 152, as confirmed by Mozilla's own vulnerability disclosure. Organizations should upgrade all Firefox installations to version 152 or later immediately, referencing the advisory at https://www.mozilla.org/security/advisories/mfsa2026-57/. For environments where patching cannot be applied immediately, compensating controls include enforcing browser media autoplay restrictions via enterprise policy (media.autoplay.default = 5 in Firefox policy settings), which would require explicit user action to trigger playback and reduces passive exposure. Blocking navigation to untrusted or unknown domains via web proxy or DNS filtering can reduce the attack surface but will not protect against malicious content on otherwise trusted sites. These workarounds carry usability trade-offs and should be treated as temporary measures pending upgrade to Firefox 152.

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Same weakness CWE-400 – Uncontrolled Resource Consumption

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CVE-2025-27473 HIGH
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Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
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CVE-2011-0611 HIGH POC
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CVE-2014-1761 HIGH POC
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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
openSUSE Tumbleweed Fixed
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

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CVE-2026-12319 vulnerability details – vuln.today
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