Description
Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.
Published: 2026-02-16
Score: 8.8 High
EPSS: < 1% Very Low
KEV: No
Impact: Heap buffer overflow potentially enabling remote code execution
Action: Immediate Patch
AI Analysis

Impact

A vulnerable heap operation in the libvpx media decoding library allows an attacker to write beyond the intended buffer boundaries. This overflow can corrupt adjacent memory structures, leading to arbitrary code execution or a complete crash. The weakness is a classic Out‑of‑Bounds Write (CWE‑122), which can compromise confidentiality, integrity, and availability if exploited.

Affected Systems

The affected products are Mozilla Firefox and Mozilla Thunderbird. Versions prior to Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2 are vulnerable. All releases newer than these contain the patch.

Risk and Exploitability

The CVSS score of 8.8 classifies this vulnerability as high severity. The EPSS probability is less than 1%, indicating a low likelihood of exploitation at this time, and it is not listed in the CISA KEV catalog. The attack vector is inferred to involve a maliciously crafted VPX media file delivered through a web page or email, as libvpx is used to decode such content in browsers and mail clients.

Generated by OpenCVE AI on April 15, 2026 at 17:10 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Upgrade to the latest versions of Mozilla Firefox and Thunderbird that include the libvpx buffer overflow fix (Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, or Thunderbird 147.0.2).
  • After applying the update, restart the affected applications to ensure the updated libvpx library is loaded.
  • Until the update can be applied, block or disable the processing of VPX‑encoded media content in browsers and mail clients, such as by blocking .vp8/.vp9 files or restricting WebP downloads from untrusted sources.

Generated by OpenCVE AI on April 15, 2026 at 17:10 UTC.

Tracking

Sign in to view the affected projects.

Advisories
Source ID Title
Debian DLA Debian DLA DLA-4489-1 libvpx security update
Debian DSA Debian DSA DSA-6143-1 libvpx security update
Ubuntu USN Ubuntu USN USN-8053-1 libvpx vulnerability
References
Link Providers
https://access.redhat.com/errata/RHSA-2026:16174 cve-icon
https://access.redhat.com/errata/RHSA-2026:3338 cve-icon
https://access.redhat.com/errata/RHSA-2026:3339 cve-icon
https://access.redhat.com/errata/RHSA-2026:3361 cve-icon
https://access.redhat.com/errata/RHSA-2026:3491 cve-icon
https://access.redhat.com/errata/RHSA-2026:3492 cve-icon
https://access.redhat.com/errata/RHSA-2026:3493 cve-icon
https://access.redhat.com/errata/RHSA-2026:3494 cve-icon
https://access.redhat.com/errata/RHSA-2026:3495 cve-icon
https://access.redhat.com/errata/RHSA-2026:3496 cve-icon
https://access.redhat.com/errata/RHSA-2026:3497 cve-icon
https://access.redhat.com/errata/RHSA-2026:3515 cve-icon
https://access.redhat.com/errata/RHSA-2026:3516 cve-icon
https://access.redhat.com/errata/RHSA-2026:3517 cve-icon
https://access.redhat.com/errata/RHSA-2026:3967 cve-icon
https://access.redhat.com/errata/RHSA-2026:3976 cve-icon
https://access.redhat.com/errata/RHSA-2026:3978 cve-icon
https://access.redhat.com/errata/RHSA-2026:3979 cve-icon
https://access.redhat.com/errata/RHSA-2026:3980 cve-icon
https://access.redhat.com/errata/RHSA-2026:3981 cve-icon
https://access.redhat.com/errata/RHSA-2026:3982 cve-icon
https://access.redhat.com/errata/RHSA-2026:3983 cve-icon
https://access.redhat.com/errata/RHSA-2026:3984 cve-icon
https://access.redhat.com/errata/RHSA-2026:4022 cve-icon
https://access.redhat.com/errata/RHSA-2026:4152 cve-icon
https://access.redhat.com/errata/RHSA-2026:4260 cve-icon
https://access.redhat.com/errata/RHSA-2026:4432 cve-icon
https://access.redhat.com/errata/RHSA-2026:4447 cve-icon
https://access.redhat.com/errata/RHSA-2026:4629 cve-icon
https://access.redhat.com/errata/RHSA-2026:5227 cve-icon
https://access.redhat.com/errata/RHSA-2026:5228 cve-icon
https://access.redhat.com/errata/RHSA-2026:5229 cve-icon
https://access.redhat.com/errata/RHSA-2026:5230 cve-icon
https://access.redhat.com/errata/RHSA-2026:5231 cve-icon
https://access.redhat.com/errata/RHSA-2026:5319 cve-icon
https://access.redhat.com/errata/RHSA-2026:5320 cve-icon
https://access.redhat.com/errata/RHSA-2026:5323 cve-icon
https://access.redhat.com/errata/RHSA-2026:5324 cve-icon
https://access.redhat.com/errata/RHSA-2026:5326 cve-icon
https://access.redhat.com/errata/RHSA-2026:8746 cve-icon
https://access.redhat.com/errata/RHSA-2026:8747 cve-icon
https://access.redhat.com/errata/RHSA-2026:8748 cve-icon
https://access.redhat.com/security/cve/CVE-2026-2447 cve-icon
https://bugzilla.mozilla.org/show_bug.cgi?id=2014390 cve-icon cve-icon cve-icon
https://bugzilla.redhat.com/show_bug.cgi?id=2440219 cve-icon
https://lists.debian.org/debian-lts-announce/2026/02/msg00028.html cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-2447 cve-icon
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-2447.json cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-2447 cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-10/ cve-icon cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2026-11/ cve-icon cve-icon
History

Mon, 13 Apr 2026 14:30:00 +0000

Type Values Removed Values Added
Description Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2. Heap buffer overflow in libvpx. This vulnerability was fixed in Firefox 147.0.4, Firefox ESR 140.7.1, Firefox ESR 115.32.1, Thunderbird 140.7.2, and Thunderbird 147.0.2.

Sun, 22 Feb 2026 21:30:00 +0000

Type Values Removed Values Added
References

Wed, 18 Feb 2026 21:45:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla thunderbird
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Vendors & Products Mozilla thunderbird

Wed, 18 Feb 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Important

Tue, 17 Feb 2026 15:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-122
Metrics cvssV3_1

{'score': 8.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Tue, 17 Feb 2026 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
Mozilla firefox Esr
Vendors & Products Mozilla
Mozilla firefox
Mozilla firefox Esr

Mon, 16 Feb 2026 15:45:00 +0000

Type Values Removed Values Added
Description Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, and Firefox ESR < 115.32.1. Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, Firefox ESR < 115.32.1, Thunderbird < 140.7.2, and Thunderbird < 147.0.2.
References

Mon, 16 Feb 2026 14:30:00 +0000

Type Values Removed Values Added
Description Heap buffer overflow in libvpx. This vulnerability affects Firefox < 147.0.4, Firefox ESR < 140.7.1, and Firefox ESR < 115.32.1.
Title Heap buffer overflow in libvpx
References

Subscriptions

Mozilla Firefox Firefox Esr Thunderbird
cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2026-07-15T02:49:22.255Z

Reserved: 2026-02-13T09:28:08.874Z

Link: CVE-2026-2447

cve-icon Vulnrichment

Updated: 2026-02-22T21:05:42.890Z

cve-icon NVD

Status : Modified

Published: 2026-02-16T15:18:34.740

Modified: 2026-07-15T02:19:30.797

Link: CVE-2026-2447

cve-icon Redhat

Severity : Important

Publid Date: 2026-02-16T14:13:23Z

Links: CVE-2026-2447 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-04-15T17:30:10Z

Weaknesses
  • CWE-122

    Heap-based Buffer Overflow