High severity · published Oct 14, 2026
CVE-2026-110599
L-SMASH through 2.14.5 Double Free in HEVC and H.264 Importer Probe
7.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 16% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LS
l-smash · l-smash
through 2.14.5 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-110599
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-110599
third-party-advisory
https://hackmd.io/@haind-pwn/l-smash-hevc-importer-double-free
technical-description
https://github.com/l-smash/l-smash/blob/v2.14.5/importer/nalu_imp.c#L1356-L1378
technical-description
https://github.com/l-smash/l-smash/blob/v2.14.5/importer/nalu_imp.c#L697-L715
third-party-advisory
https://www.vulncheck.com/advisories/l-smash-through-2.14.5-double-free-in-hevc-and-h-264-importer-probe
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