UBUNTU-CVE-2026-64830

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    UBUNTU-CVE-2026-64830

    Published: 22 Jul 2026Last Modified: 10 Sept 2026
    Upstream:
    CVE-2026-64830

    Summary:

    Details: 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.

    References: https://ubuntu.com/security/CVE-2026-64830, https://www.cve.org/CVERecord?id=CVE-2026-64830, https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23657, https://ubuntu.com/security/notices/USN-8716-1, https://ubuntu.com/security/notices/USN-8716-2

    Affected packages

    Package

    Name: libav

    Purl: pkg:deb/ubuntu/libav?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    6:0.8.7-1ubuntu2

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2026-64830 | CVE-DB