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CVE-2026-12319 Mozilla CVE debrief

CVE-2026-12319 is a denial-of-service vulnerability in the Audio/Video: Playback component. The vulnerability was fixed in Firefox 152. The CVE was published and modified on 2026-06-16T13:16:32.563Z. The vendor is currently listed as Unknown Vendor, but evidence suggests the vulnerability may be related to Mozilla. For more information, see [cve-org](https://www.cve.org/CVERecord?id=CVE-2026-12319) and [nvd](https://nvd.nist.gov/vuln/detail/CVE-2026-12319).

Vendor
Mozilla
Product
Firefox
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-16
Original CVE updated
2026-06-16
Advisory published
2026-06-16
Advisory updated
2026-06-16

Who should care

Users of Firefox, particularly those who use the Audio/Video: Playback component, should be aware of this vulnerability and ensure they are running Firefox 152 or later.

Technical summary

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

Defensive priority

medium

Recommended defensive actions

  • Update Firefox to version 152 or later.
  • Review [ref-4](https://bugzilla.mozilla.org/show_bug.cgi?id=2026933) and [ref-5](https://www.mozilla.org/security/advisories/mfsa2026-57/) for more information.

Evidence notes

The vendor is currently listed as Unknown Vendor, but evidence suggests the vulnerability may be related to Mozilla.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-12319 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-12319

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-12319 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-12319

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.