CVE-2026-64830

Publication date 22 July 2026

Last updated 4 September 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

8.8 · High

Score breakdown

Description

FFmpeg versions 2.1 through 8.1.2 contains a heap buffer overflow vulnerability in the VobSub subtitle demuxer that allows attackers to corrupt adjacent heap memory by supplying a malicious .sub/.idx subtitle file declaring more distinct stream IDs than the fixed-size array bounds in libavformat/mpeg.c. Attackers can craft a subtitle file with excessive distinct stream IDs to trigger unbounded writes beyond the vobsub->q[] array boundary via ff_subtitles_queue_insert(), potentially achieving arbitrary code execution in any application using FFmpeg's VobSub demuxer.

Status

Package Ubuntu Release Status
ffmpeg 26.04 LTS resolute
Vulnerable
24.04 LTS noble
Fixed 7:6.1.1-3ubuntu5+esm13
22.04 LTS jammy
Fixed 7:4.4.2-0ubuntu0.22.04.1+esm15
20.04 LTS focal
Fixed 7:4.2.7-0ubuntu0.1+esm16
18.04 LTS bionic
Fixed 7:3.4.11-0ubuntu0.1+esm15
16.04 LTS xenial
Fixed 7:2.8.17-0ubuntu0.1+esm17
libav 26.04 LTS resolute Not in release
24.04 LTS noble Not in release
22.04 LTS jammy Not in release
14.04 LTS trusty
Needs evaluation

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Severity score breakdown

CVSS version:

Base score 8.7 · High

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Base score 8.8 · High

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-8716-1
    • FFmpeg vulnerabilities
    • 3 September 2026

Other references

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