Back Linuxsecurity

Debian LTS libass Critical DoS Issue DLA-4769-1 CVE-2026

Linuxsecurity •LinuxSecurity Advisories • September 2, 2026

Keep your Linux systems secure and up to date with practical patching guidance. Review Linux Patching Best Practices ×

CVE-2026-61627 An an out-of-bounds read and write exist that could potentially lead to a DoS. For Debian 12 bookworm, this problem has been fixed in version 1:0.17.1-1+deb12u1. We recommend that you upgrade your libass packages. For the detailed security status of libass please refer to its security tracker page at: Further information Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at:

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Linux Security - Your source for Top Linux News, Advisories, HOWTOs and Feature Releases

The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Debian LTS Security Updates Address Critical Vulnerabilities in Expat and Libass Debian has released security updates for two libraries, Expat and Libass, addressing multiple vulnerabilities. The Expat library has several CVEs, including CVE-2026-56403 to CVE-2026-56412, which involve use-after-free issues and integer overflows, potentially leading to denial of service. The Libass library has a critical out-of-bounds read/write vulnerability (CVE-2026-61627) that could also result in a denial of service. Users of Debian 12 (Bookworm) are advised to upgrade to the patched versions: Expat 2.5.0-1+deb12u3 and Libass 1:0.17.1-1+deb12u1. These vulnerabilities could be exploited by attackers to disrupt services or execute arbitrary code. The updates were published on August 31 and September 2, 2026, respectively, with the Expat vulnerabilities being known since June 21, 2026. Administrators are urged to apply these updates promptly to mitigate risks. 2 sources 46

Extracted Entities

Debian LTS libass Critical DoS Issue DLA-4769-1 CVE-2026

The full story

Extracted Entities

Attack Types (1)

CVEs (1)

CWE Weaknesses (2)

Platforms (1)