Vulnerability in L-Smash
CVE-2016-20099
L-SMASH through 2.14.5 contains an infinite loop vulnerability in vc1_importer_probe() in importer/vc1_imp.c that allows attackers to hang applications via crafted input files. Attackers can supply a file consisting only of zero bytes, which lsmash_read_file() probes automatically, causing indefinite CPU consumption and denial of service.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/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
- github.com/l-smash/l-smash/pull/58 (issue-tracking, patch)
- github.com/l-smash/l-smash/blob/v2.14.5/importer/vc1_imp.c (technical-description)
- hackmd.io/@haind-pwn/l-smash-hevc-importer-double-free (third-party-advisory)
- www.vulncheck.com/advisories/l-smash-through-2.14.5-infinite-loop-in-vc-1-impor… (third-party-advisory)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0
Frequently asked questions
- What is CVE-2016-20099?
- CVE-2016-20099 is a medium-severity vulnerability in L-Smash, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.5/10. Published 2026-10-14.
- How severe is CVE-2016-20099?
- Medium severity. CVSS v3 base score is 5.5 out of 10.