What’s Vulnerable › Vulnerabilities

CVE-2016-20099: L-SMASH through 2.14.5 Infinite Loop in VC-1 Importer Probe

• Severity: medium (CVSS 5.5 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 2026-10-16
• Weakness: CWE-835

Description

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.

Affected products

• l-smash: through 2.14.5

References

• https://github.com/l-smash/l-smash/blob/v2.14.5/importer/vc1_imp.c#L462-L488
• https://github.com/l-smash/l-smash/pull/58
• https://hackmd.io/@haind-pwn/l-smash-hevc-importer-double-free
• https://www.vulncheck.com/advisories/l-smash-through-2.14.5-infinite-loop-in-vc-1-importer-probe
• https://hackmd.io/@haind-pwn/cve-2016-20099-2026-110599-l-smash-hevc-importer-double-free

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