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CVE-2026-2447Heap buffer overflow in libvpx

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.

Timeline

  1. ID reserved

    By mozilla

  2. · 3 days later

    Published

  3. · 5 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-2447, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1High8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
redhat-SADPADP (enrichment)3.1High7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
NVDNVD · Modified3.1High8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.69% · top 47% of all CVEs (13 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: total
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.8.

Affected products

  • Mozilla · Firefox

    • unaffected 115.32.1 – ≤ 115.*
    • unaffected 140.7.1 – ≤ 140.*
    • unaffected 147.0.4 – ≤ *

  • Mozilla · Thunderbird

    • unaffected 140.7.2 – ≤ 140.*
    • unaffected 147.0.2 – ≤ *

References

References49

Sources

The same CVE in the primary databases and aggregators, to check against.

Badge for a README or a ticket

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[![CVE-2026-2447](https://cveledger.app/badge/CVE-2026-2447.svg)](https://cveledger.app/cve/CVE-2026-2447)

Record last updated .