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

Quick assessment

Affected

Ultra Video Group Kvazaar

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kvazaar 2.3.2 及以下版本在的函数中存在无限循环漏洞。攻击者可通过提供截断的 Y4M 文件头，使命令行编码器陷入挂起状态。具体而言，攻击者可构造一个缺少终止换行符的文件，导致程序在执行未检查的 EOF（文件末尾）读取时进入无限循环，从而永久挂起进程并占用一个完整的 CPU 核心。

CVSS 5.5 · Medium Updated Nov 02, 2026

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 1

Vendor	Product	Version Range	Status
Ultra Video Group	Kvazaar	`≤ 2.3.2`	affected

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Vulnerability Information

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Vulnerability Title

Kvazaar through 2.3.2 Infinite Loop DoS via Y4M Header Parser

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

不可达退出条件的循环(无限循环)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Ultra Video Group	Kvazaar	0 ~ 2.3.2	-

II. Public POCs for CVE-2026-120458

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-120458

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Other References for CVE-2026-120458 (6)

https://github.com/ultravideo/kvazaar/issues/452 issue-tracking
https://github.com/ultravideo/kvazaar/commit/8a2f109be283e87008c679d635966cc034da39c6 patch
https://github.com/ultravideo/kvazaar/blob/v2.3.2/src/encmain.c#L339-L357 technical-description
https://hackmd.io/@haindpwn/kvazaar-y4m-header-missing-newline-infinite-loop technical-description
https://github.com/ultravideo/kvazaar/releases/tag/v2.3.2 release-notes
https://www.vulncheck.com/advisories/kvazaar-through-2.3.2-infinite-loop-dos-via-y4m-header-parser third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-120458

IV. Related Vulnerabilities

Same weakness: CWE-835