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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
Mozilla Denial Of Service Suse Red Hat
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

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
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. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Attacker crafts malicious audio/video media
Delivery
Victim lured to attacker-controlled page
Exploit
Firefox Audio/Video Playback component processes crafted stream
Execution
Uncontrolled resource consumption triggered
Impact
Browser process crashes or becomes unresponsive
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Vulnerability AssessmentAI

Exploitation Exploitation requires a victim to actively navigate to a page hosting malicious audio or video content using a Firefox version prior to 152 - the CVSS UI:R metric confirms this mandatory user interaction step. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.1 score of 6.5 (Medium) is well-calibrated for this vulnerability: the AV:N/AC:L/PR:N combination reflects easy network delivery, but UI:R constrains the attack to scenarios where a victim must visit attacker-controlled content, limiting mass automation. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker crafts a web page embedding a malicious audio or video file engineered to trigger uncontrolled resource consumption in Firefox's media playback engine. The attacker distributes a link to this page via phishing email or malicious advertisement, and when a victim running Firefox prior to version 152 visits the page, the browser's playback component enters an uncontrolled resource exhaustion loop, causing the browser process to become unresponsive or crash. …
Remediation The vendor-released patch is Firefox 152, as confirmed by Mozilla's own vulnerability disclosure. … Detailed patch versions, workarounds, and compensating controls in full report.
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Same weakness CWE-400 – Uncontrolled Resource Consumption

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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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