CVE-2026-110599 L-SMASH through 2.14.5 Double Free in HEVC and H.264 Importer Probe
Attackers can trigger a double free and heap corruption in L-SMASH by providing crafted media streams, leading to crashes or potential code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-110599?
CVE-2026-110599 is a medium-severity use after free vulnerability in l-smash, published on 14 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
L-SMASH through 2.14.5 contains a double free vulnerability in hevc_setup_first_summary() and h264_setup_first_summary() in importer/nalu_imp.c that frees borrowed codec-specific objects on error paths. Attackers can supply a crafted Annex-B elementary stream lacking a parseable SPS to lsmash_read_file() or the boxdumper, remuxer, or muxer tools, causing use-after-free, heap corruption, and crashes.
Weakness: CWE-415
Which versions are affected by CVE-2026-110599?
How do I fix CVE-2026-110599?
No fix has been published for CVE-2026-110599 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-110599 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110599 exists.
Sources
Also known as GHSA-4h8q-hwh6-8jpj.