Memory Corruption Vulnerability in libass Product by Libass
CVE-2026-61626

7.3HIGH

Key Information:

Vendor

Libass

Status
Libass
Vendor
CVE Published:
30 October 2026

What is CVE-2026-61626?

A vulnerability exists in libass, a subtitle rendering library, where event pruning does not properly handle negative Matroska ReadOrder values. This can allow an attacker to manipulate memory and potentially cause a denial of service through specially crafted Matroska streams. The issue requires specific conditions to be exploited, such as enabled read-order checking and malicious event pruning. Fixes are available starting from version 0.17.5.

Affected Version(s)

libass >= 0.17.4, < 0.17.5

References

https://github.com/libass/libass/security/advisories/GHSA...
x_refsource_CONFIRM
https://github.com/libass/libass/commit/23da65a130bb8c5b2...
x_refsource_MISC
https://github.com/libass/libass/releases/tag/0.17.5
x_refsource_MISC

CVSS V4

Score:
7.3
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.