CVE-2026-120208

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    CVE-2026-120208

    Published: 31 Oct 2026Last Modified: 1 Nov 2026

    Summary: libheif 1.18.0 before 1.23.3 Heap Buffer Overflow via unci Mixed-Interleave Decoder

    Details: libheif 1.18.0 before 1.23.3 contains a heap-based buffer overflow vulnerability in unc_decoder_mixed_interleave::processTile() that allows attackers to write out of bounds by supplying chroma components with unequal bit depths. Attackers can craft a HEIF file declaring, for example, 16-bit Cb and 8-bit Cr to trigger file-controlled heap writes past the Cr plane, potentially achieving code execution in image-processing pipelines.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/120xxx/CVE-2026-120208.json, https://github.com/strukturag/libheif, https://github.com/strukturag/libheif/blob/v1.23.2/libheif/codecs/uncompressed/unc_decoder_mixed_interleave.cc#L95, https://github.com/strukturag/libheif/commit/9d3cd91d7b1c8c68deef6d06057ab956bcb0dfb9, https://github.com/strukturag/libheif/releases/tag/v1.23.3, https://github.com/strukturag/libheif/security/advisories/GHSA-x8r2-mggj-j6wr, https://nvd.nist.gov/vuln/detail/CVE-2026-120208, https://www.vulncheck.com/advisories/libheif-1.18.0-before-1.23.3-heap-buffer-overflow-via-unci-mixed-interleave-decoder

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 537d66852629e23ca778ef717343be8f657c0e79
    Fixed -78c9746aea226b22885e8d35241353ce669c4ea5

    Affected versions

    v1.23.2
    v1.23.1
    v1.23.0

    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