CVE-2026-110599
L-SMASH through 2.14.5 Double Free in HEVC and H.264 Importer Probe
l-smash l-smash
CVSS
6.9MediumExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 14 Oct 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.24%Chance of exploitation activity in the next 30 days, higher than 14% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List
Affected versions 1
- l-smashaffected: all versions through 2.14.5CVE List
References 5
- hackmd.io/@haind-pwn/l-smash-hevc-importer-double-freeAdvisoryvia CVE List
- vulncheck.com/advisories/l-smash-through-2.14.5-double-free-in-hevc-and-h-264-importer-probeAdvisoryvia CVE List
- hackmd.io/@haind-pwn/cve-2016-20099-2026-110599-l-smash-hevc-importer-double-freeExploitvia CVE List
- github.com/l-smash/l-smash/blob/v2.14.5/importer/nalu_imp.c#L1356-L1378Referencevia CVE List
- github.com/l-smash/l-smash/blob/v2.14.5/importer/nalu_imp.c#L697-L715Referencevia CVE List