What’s Vulnerable › Vulnerabilities

CVE-2026-110599: L-SMASH through 2.14.5 Double Free in HEVC and H.264 Importer Probe

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-15
• Weakness: CWE-415

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.

Affected products

• l-smash: through 2.14.5

References

• https://github.com/l-smash/l-smash/blob/v2.14.5/importer/nalu_imp.c#L1356-L1378
• https://github.com/l-smash/l-smash/blob/v2.14.5/importer/nalu_imp.c#L697-L715
• https://hackmd.io/@haind-pwn/l-smash-hevc-importer-double-free
• https://www.vulncheck.com/advisories/l-smash-through-2.14.5-double-free-in-hevc-and-h-264-importer-probe
• https://hackmd.io/@haind-pwn/cve-2016-20099-2026-110599-l-smash-hevc-importer-double-free

Get alerted when CVE-2026-110599 or the next vulnerability affects your stack