Vulnerability in Ultra Video Group Kvazaar
CVE-2026-120458
Kvazaar through 2.3.2 contains an infinite loop vulnerability in read_header() in src/encmain.c that allows attackers to hang the command-line encoder by supplying a truncated Y4M header. Attackers can provide a crafted .y4m file lacking a terminating newline, causing unchecked EOF reads that hang the process indefinitely while consuming a full CPU core.
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/ultravideo/kvazaar/issues/452 (issue-tracking)
- github.com/ultravideo/kvazaar/commit/8a2f109be283e87008c679d635966cc034da39c6 (patch)
- github.com/ultravideo/kvazaar/blob/v2.3.2/src/encmain.c (technical-description)
- github.com/ultravideo/kvazaar/releases/tag/v2.3.2 (release-notes)
- hackmd.io/@haindpwn/kvazaar-y4m-header-missing-newline-infinite-loop (technical-description)
- www.vulncheck.com/advisories/kvazaar-through-2.3.2-infinite-loop-dos-via-y4m-he… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-120458?
- CVE-2026-120458 is a medium-severity vulnerability in Ultra Video Group Kvazaar, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 5.5/10. Published 2026-11-02.
- How severe is CVE-2026-120458?
- Medium severity. CVSS v3 base score is 5.5 out of 10.