What’s Vulnerable › Vulnerabilities

CVE-2026-2447: Heap buffer overflow in libvpx

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-16 · updated 2026-07-15
• Weakness: CWE-122

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.

Affected products

• Mozilla Firefox: before 115.32.1; before 147.0.4; from 116.0 before 140.7.1 — fixed in 115.32.1, 140.7.1, 147.0.4
• Mozilla Thunderbird: before 140.7.2; from 141.0 before 147.0.2 — fixed in 140.7.2, 147.0.2

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.32.1, 140.7.1, 147.0.4; Mozilla Thunderbird 140.7.2, 147.0.2. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2014390
• https://www.mozilla.org/security/advisories/mfsa2026-10/
• https://www.mozilla.org/security/advisories/mfsa2026-11/
• https://lists.debian.org/debian-lts-announce/2026/02/msg00028.html
• https://access.redhat.com/errata/RHSA-2026:16174
• https://access.redhat.com/errata/RHSA-2026:3338
• https://access.redhat.com/errata/RHSA-2026:3339
• https://access.redhat.com/errata/RHSA-2026:3361
• https://access.redhat.com/errata/RHSA-2026:3491
• https://access.redhat.com/errata/RHSA-2026:3492
• https://access.redhat.com/errata/RHSA-2026:3493
• https://access.redhat.com/errata/RHSA-2026:3494

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