CVE-2026-120456

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    CVE-2026-120456

    Published: 2 Nov 2026Last Modified: 4 Nov 2026

    Summary: L-SMASH through 2.14.5 Heap Out-of-Bounds Write via hdlr and url Boxes

    Details: L-SMASH through 2.14.5 contains a heap out-of-bounds write vulnerability in isom_read_hdlr() and isom_read_dref_entry() in core/read.c triggered by oversized box sizes. Attackers can supply crafted MP4 or MOV files declaring hdlr or url box sizes larger than remaining data, stalling the stream position and corrupting heap memory to crash applications.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/120xxx/CVE-2026-120456.json, https://nvd.nist.gov/vuln/detail/CVE-2026-120456, https://www.vulncheck.com/advisories/l-smash-through-2.14.5-heap-out-of-bounds-write-via-hdlr-and-url-boxes, https://github.com/l-smash/l-smash/issues/112, https://github.com/l-smash/l-smash/commit/805ee3c9632e054198d3cb5b09c7b7aa36cdd791, https://github.com/l-smash/l-smash, https://github.com/l-smash/l-smash/blob/v2.14.5/core/read.c#L688-L717, https://github.com/l-smash/l-smash/blob/v2.14.5/core/read.c#L853-L876, https://hackmd.io/@haindpwn/lsmash-hdlr-dref-box-size-oob-write

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -805ee3c9632e054198d3cb5b09c7b7aa36cdd791

    Affected versions

    v2.14.5

    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
    CVE-2026-120456 | CVE-DB