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    CVE-2026-125269

    FFmpeg through 9.0.2 contains a double free vulnerability in libavcodec/cbs_sei.c where cbs_sei_delete_message() leaves a stale extension_data reference that ff_cbs_sei_add_message() reuses. Attackers can supply a crafted H.264 stream with a display orientation SEI message followed by payload extension data, processed by h264_metadata with display_orientation=insert, to corrupt heap memory.

    Published:Nov 9, 2026
    Last Modified:Nov 9, 2026
    EPS:Nov 9, 2026
    EPSS Score:
    CVSS Score:7

    Affected Products

    Vendor
    Ffmpeg
    Product
    Ffmpeg

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-415 Double Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-125270 (CVSS 5.8) — FFmpeg through 9.0.2 contains a heap out-of-bounds read vulnerability in v4l2_buffer_swframe_to_buf() in libav…
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    CVE-2026-125267 (CVSS 8.5) — FFmpeg before 8.1.3 and 9.x before 9.0.2 contains a heap out-of-bounds write vulnerability in the APAC decoder…
    CVE-2026-125266 (CVSS 4.8) — FFmpeg through 9.0.2 contains an uninitialized stack memory disclosure vulnerability in old_codec23() of libav…
    CVE-2026-125265 (CVSS 5.8) — FFmpeg through 9.0.2 contains a use-after-free vulnerability in libavcodec/nvdec.c because ff_nvdec_start_fram…
    CVE-2026-125264 (CVSS 6.8) — FFmpeg through 9.0.2 contains an uncontrolled resource consumption vulnerability in parse_frame_header() in li…
    CVE-2026-125263 (CVSS 5.7) — FFmpeg 9.0 through 9.0.2 built with liblcevc_dec fails to validate LCEVC enhanced output dimensions against ma…
    CVE-2026-125262 (CVSS 8.5) — FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in libavcodec/lcevcdec.c because LCEVC outp…
    CVE-2026-125261 (CVSS 6.9) — FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the SGI encoder's encode_frame() in libav…
    CVE-2026-125260 (CVSS 7.3) — FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in libavcodec/exrenc.c that allows attacker…

    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