# CVE-2026-120458: Kvazaar through 2.3.2 Infinite Loop DoS via Y4M Header Parser

Status: published. Published: 2026-11-02. Updated: 2026-11-02.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Ultra Video Group / Kvazaar: ≥ 0; ≤ 2.3.2 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.8 (medium); 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; source: CNA: VulnCheck

- CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-835

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/ultravideo/kvazaar/issues/452 (CNA: VulnCheck; issue-tracking)

- https://github.com/ultravideo/kvazaar/commit/8a2f109be283e87008c679d635966cc034da39c6 (CNA: VulnCheck; patch)

- https://github.com/ultravideo/kvazaar/blob/v2.3.2/src/encmain.c#L339-L357 (CNA: VulnCheck; technical-description)

- https://github.com/ultravideo/kvazaar/releases/tag/v2.3.2 (CNA: VulnCheck; release-notes)

- https://hackmd.io/@haindpwn/kvazaar-y4m-header-missing-newline-infinite-loop (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/kvazaar-through-2.3.2-infinite-loop-dos-via-y4m-header-parser (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-120458; retrieved 2026-11-02; source updated 2026-11-02

Revision: 2edbaa8e661b5fd66022e123fb081b0ab28b9fda998032d5f055b168e71be511

Canonical: https://y2.dev/cve/CVE-2026-120458

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.