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    CVE-2026-33165

    libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.17, a crafted HEVC bitstream causes an out-of-bounds heap write confirmed by AddressSanitizer. The trigger is a stale ctb_info.log2unitSize after an SPS change where PicWidthInCtbsY and PicHeightInCtbsY stay constant but Log2CtbSizeY changes, causing set_SliceHeaderIndex to index past the allocated image metadata array and write 2 bytes past the end of a heap allocation. This issue has been patched in version 1.0.17.

    Published:Mar 20, 2026
    Last Modified:Mar 25, 2026
    EPS:Mar 20, 2026
    EPSS Score:0.00012
    CVSS Score:5.5

    Affected Products

    Vendor
    Struktur
    Product
    Libde265

    Exploits

    https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvg

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-45383 (CVSS 6.9) — libde265 is an open source implementation of the h.265 video codec. Versions prior to 1.0.19 have a heap buffe…
    CVE-2026-45382 (CVSS 6.9) — libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.19, `decoder_context:…
    CVE-2026-49346 (CVSS 7.1) — libde265 is an open source implementation of the h.265 video codec. Prior to version 1.1.0, a crafted H.265 bi…
    CVE-2026-49295 (CVSS 7.1) — libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted H.265 b…
    CVE-2026-49337 (CVSS 4.3) — libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.20, a crafted sequenc…
    CVE-2026-33164 (CVSS 8.7) — libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.17, a malformed H.265…
    CVE-2025-61147 (CVSS 6.2) — strukturag libde265 commit d9fea9d wa discovered to contain a segmentation fault via the component decoder_con…
    CVE-2024-38949 (CVSS 6.5) — Heap Buffer Overflow vulnerability in Libde265 v1.0.15 allows attackers to crash the application via crafted p…
    CVE-2024-38950 (CVSS 6.5) — Heap Buffer Overflow vulnerability in Libde265 v1.0.15 allows attackers to crash the application via crafted p…
    CVE-2023-49467 (CVSS 8.8) — Libde265 v1.0.14 was discovered to contain a heap-buffer-overflow vulnerability in the derive_combined_bipredi…

    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