Double Free in L-Smash
CVE-2026-110599
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.
Vulnerability class: Double Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@haind-pwn/l-smash-hevc-importer-double-free (third-party-advisory)
- github.com/l-smash/l-smash/blob/v2.14.5/importer/nalu_imp.c (technical-description)
- github.com/l-smash/l-smash/blob/v2.14.5/importer/nalu_imp.c (technical-description)
- www.vulncheck.com/advisories/l-smash-through-2.14.5-double-free-in-hevc-and-h-2… (third-party-advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0
Frequently asked questions
- What is CVE-2026-110599?
- CVE-2026-110599 is a high-severity vulnerability in L-Smash, classified under Double Free. CVSS score: 7.1/10. Published 2026-10-14.
- How severe is CVE-2026-110599?
- High severity. CVSS v3 base score is 7.1 out of 10.