CVE-2026-120458: Ultra Video Group Kvazaar

Kvazaar through 2.3.2 Infinite Loop DoS via Y4M Header Parser

CVSS 6.8 MediumEPSS 0.0016 · 5th percentile

Published by the CVE Program (CNA: VulnCheck) at 2 Nov 2026, 14:29 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Ultra Video Group	Kvazaar	affected 2.3.2 and earlier semver Other versions: unaffected

Identifiers

CVE-2026-120458

CNA

VulnCheck

Weakness (CWE)

CWE-835

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
6.8	Medium	4.0	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	CNA (VulnCheck)Used for this record
5.5	Medium	3.1	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0016, the 5th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

2 Nov 2026, 14:29 UTC Confirmed by the CVE List
2 Nov 2026, 14:37 UTC First seen by agentprime
2 Nov 2026, 15:17 UTC Confirmed by NVD

Sources

References from the CNA

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#L339-L357 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-header-parser third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.