Two critical vulnerabilities (CVE-2022-25235 and CVE-2022-25236, CVSS 9.8) in the Expat library vendored within the Ayttm instant messaging client could allow an attacker to cause a crash or execute arbitrary code via specially crafted files. The underlying Expat library is affected in versions prior to 2.4.5. Ubuntu 16.04 LTS users should update the Ayttm package to version 0.6.3-3ubuntu0.1~esm1 to remediate the issue.
Ubuntu Security Notices USN-8314-1 USN-8314-1: Ayttm vulnerabilities Publication date 27 May 2026 Overview Several security issues were fixed in Ayttm. Releases 16.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Related notices Packages ayttm - Universal Instant Messaging Client Details It was discovered that Expat, vendored in Ayttm, incorrectly handled certain files. An attacker could possibly use this issue to cause a crash or execute arbitrary code. It was discovered that Expat, vendored in Ayttm, incorrectly handled certain files. An attacker could possibly use this issue to cause a crash or execute arbitrary code. Update instructions In general, a standard system update will make all the necessary changes. Learn more about how to get the fixes. The problem can be corrected by updating your system to the following package versions: Ubuntu Release Package Version 16.04 LTS xenial ayttm – 0.6.3-3ubuntu0.1~esm1 Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. Get Ubuntu Pro References CVE-2022-25236 CVE-2022-25235 CVE-2022-25236 CVE-2022-25235 Related notices USN-8313-1 USN-8241-1 USN-8240-1 USN-8235-1 USN-5455-1 USN-5288-1 USN-8313-1 USN-8241-1 USN-8240-1 USN-8235-1 USN-5455-1 USN-5288-1