High 8.8Published Feb 16, 2026

CVE-2026-2447Heap buffer overflow in libvpx

Updated under an hour ago (Oct 26, 2026, 2:10 PM ET)

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It affects Mozilla Firefox and 10 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 8.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-122
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mozilla
NVD analysis: Modified
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Mozilla Firefox mozilla:firefox (from the name)	115.32.1 builds before 115.* not affected; 140.7.1 builds before 140.* not affected; from 147.0.4 not affected	CNA record
Mozilla Thunderbird mozilla:thunderbird (from the name)	140.7.2 builds before 140.* not affected; from 147.0.2 not affected	CNA record
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	from 0:140.8.0-2.el10_1 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support redhat:enterprise_linux_eus	from 0:140.8.0-2.el10_0 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support redhat:rhel_els	from 0:140.8.0-2.el7_9 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support redhat:rhel_aus	from 0:140.8.0-2.el8_2 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On redhat:rhel_eus_long_life	from 0:140.8.0-2.el8_4 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service redhat:rhel_tus	from 0:140.8.0-2.el8_6 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions redhat:rhel_e4s	from 0:140.8.0-2.el8_6 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support redhat:rhel_eus	from 0:140.8.0-2.el9_4 not affected	CISA ADP
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References

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2014390	issue-tracking, permissions-required
https://www.mozilla.org/security/advisories/mfsa2026-10/	vendor-advisory
https://www.mozilla.org/security/advisories/mfsa2026-11/	vendor-advisory
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
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.