Infinite loop in Kvazaar Y4M header parser allows denial of service
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Passive
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-835.
Summary
Kvazaar through 2.3.2 contains an infinite loop in the read_header() function in src/encmain.c. Unchecked end-of-file reads leave the loop without a reachable exit when a Y4M header is truncated (CWE-835). An attacker who supplies a crafted .y4m file that lacks a terminating newline can make the command-line encoder hang and consume a full CPU core when a user processes the file.
Written with Claude Haiku 5.5 from the sources below · 2026-11-07
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Ultra Video Group | Kvazaar | up to 2.3.2 | — | No fix listed | CNA |
- Kvazaar VendorUltra Video Group Affected up to 2.3.2 Fixed in — No fix listed CNA
Remediation
The sources list no fixed version for Kvazaar.
Written with Claude Haiku 5.5 from the sources below · 2026-11-07
Timeline
- 2026-11-02 Threatist record created from CVE-2026-120458
- 2026-11-02 Alias added: GHSA-chw9-qpvj-3r3m
- 2026-11-04 Priority changed: MEDIUM → LOW
- 2026-11-07 CISA SSVC decision points changed
- 2026-11-07 Priority changed: LOW → MEDIUM
References
Sources
- CVE-2026-120458 · CVE Program
- CVE-2026-120458 · NVD
- FIRST EPSS
- GHSA-chw9-qpvj-3r3m · GitHub Advisory Database · CC BY 4.0
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