Out-of-bounds write in libass - CVE-2026-61627
Published: July 22, 2026
Vulnerability identifier: #VU139175
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-61627
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: libass
Affected software:
libass
libass
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to out-of-bounds read and out-of-bounds write in wrap_lines_measure when parsing malicious ASS content. A remote attacker can trick the victim into loading crafted ASS content to cause a denial of service.
User interaction is required to load the crafted ASS content.
How to mitigate CVE-2026-61627
Install security update from vendor's website.