---
id: CVE-2026-120458
title: Kvazaar through 2.3.2 Infinite Loop DoS via Y4M Header Parser
summary: >-
  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…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-835
vendor: Ultra Video Group
product: Kvazaar
affected:
  - Kvazaar <= 2.3.2
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-07T00:19:27.404269Z'
exploitAvailable: true
published: '2026-11-02'
updated: '2026-11-07'
sourceUpdated: '2026-11-07T00:19:55.916Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120458'
references:
  - url: 'https://github.com/ultravideo/kvazaar/issues/452'
  - url: >-
      https://github.com/ultravideo/kvazaar/commit/8a2f109be283e87008c679d635966cc034da39c6
  - url: 'https://github.com/ultravideo/kvazaar/blob/v2.3.2/src/encmain.c#L339-L357'
  - url: 'https://github.com/ultravideo/kvazaar/releases/tag/v2.3.2'
    label: Kvazaar v2.3.2 Release Notes
  - url: >-
      https://hackmd.io/@haindpwn/kvazaar-y4m-header-missing-newline-infinite-loop
  - url: >-
      https://www.vulncheck.com/advisories/kvazaar-through-2.3.2-infinite-loop-dos-via-y4m-header-parser
    label: >-
      VulnCheck Advisory: Kvazaar through 2.3.2 Infinite Loop DoS via Y4M Header
      Parser
tags:
  - cve.org
  - exploit-available
epss: 0.00165
epssPercentile: 0.05792
ingestedAt: '2026-11-05T19:30:42.660Z'
---

## Overview

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.

## Affected

- `Kvazaar <= 2.3.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.