What is CVE-2026-70631?

CVE-2026-70631 is a medium-severity vulnerability in Ffmpeg, classified under Use of Uninitialized Resource. CVSS score: 5.5/10. Published 2026-08-06.

How severe is CVE-2026-70631?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Ffmpeg

CVE-2026-70631

FFmpeg versions from 0.5 up to, but not including, 9.0 contain an uninitialized heap memory disclosure vulnerability in the native TIFF decoder in libavcodec/tiff.c. An attacker who can cause FFmpeg to decode a crafted TIFF file can supply…

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Ffmpeg — versions 0.5

Weakness classification (CWE)

CWE-908 — Use of Uninitialized Resource

References

disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (related)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-70631?: CVE-2026-70631 is a medium-severity vulnerability in Ffmpeg, classified under Use of Uninitialized Resource. CVSS score: 5.5/10. Published 2026-08-06.
How severe is CVE-2026-70631?: Medium severity. CVSS v3 base score is 5.5 out of 10.