CVE-2026-120456
mediumL-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 b…
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.
CVSS
6.1
6.1 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H Severity source: NVD CVSS v3.1 (disclosure@vulncheck.com)
Timeline (UTC)
Published: 2026-11-02 15:17
Modified: 2026-11-02 18:18
NVD status: Deferred
Last synced 1 day ago
Verified against the source API 2026-11-03 07:35 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/l-smash/l-smash/blob/v2.14.5/core/read.c#L688-L717 disclosure@vulncheck.com
- https://github.com/l-smash/l-smash/blob/v2.14.5/core/read.c#L853-L876 disclosure@vulncheck.com
- https://github.com/l-smash/l-smash/commit/805ee3c9632e054198d3cb5b09c7b7aa36cdd791 disclosure@vulncheck.com
- https://github.com/l-smash/l-smash/issues/112 disclosure@vulncheck.com
- https://hackmd.io/@haindpwn/lsmash-hdlr-dref-box-size-oob-write disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/l-smash-through-2.14.5-heap-out-of-bounds-write-via-h... disclosure@vulncheck.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 07:35 UTC · record ↗