Live › vulnerability › CVE-2026-120456
L-SMASH is a library for reading and writing MP4 and MOV media files. A crafted file with oversized box sizes makes the parser write past a heap buffer, corrupting memory and crashing the application that opens it.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-11-02 15:24 UTC. All times on this page are UTC.
Applications that embed L-SMASH to parse MP4 or MOV files, especially those that open media from untrusted sources such as uploads or downloads. Systems that never parse media with this library can skip it. The sources do not name a fixed version, though a patch link is listed.
No product ranges from the sources yet.
L-SMASH library (liblsmash) is linked into any application or build you run, for example with ldd on the binary or by searching the dependency manifest.2.14.5.No fix yet, per the sources.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
This page as .md · .json · in your agent: get_signal("CVE-2026-120456")
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