CVE-2026-120247

    Dashboard / Vulnerabilities / CVE-2026-120247

    CVE-2026-120247

    Published: 1 Nov 2026Last Modified: 8 Nov 2026

    Summary: FFmpeg 2.3 through 9.0.2 Huffyuv Decoder Uninitialized Heap Memory Disclosure

    Details: FFmpeg 2.3 through 9.0.2 contains a use of uninitialized resource vulnerability in the Huffyuv decoder that allows attackers to leak heap memory into decoded pixels via short packed-BGR bitstreams. Attackers can craft a Huffyuv BGR24/BGRA video whose entropy data ends early, causing decode_slice() to add uninitialized s->temp[0] bytes into output frames, exposing heap contents.

    References: https://code.ffmpeg.org/FFmpeg/FFmpeg, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/120xxx/CVE-2026-120247.json, https://nvd.nist.gov/vuln/detail/CVE-2026-120247, https://www.vulncheck.com/advisories/ffmpeg-2.3-through-9.0.2-huffyuv-decoder-uninitialized-heap-memory-disclosure, https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24869, https://github.com/FFmpeg/FFmpeg/commit/7c73707355708c846f718cca90096bc1a33c8989, https://github.com/FFmpeg/FFmpeg, https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/huffyuvdec.c#L802

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 3ec3f70ddb1b97fd6174ab3ca8617d8a1a6516ab
    Fixed -7c73707355708c846f718cca90096bc1a33c8989

    Affected versions

    n9.1-dev

    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