Denial of Service Vulnerabilities in Ubuntu's libheif Disclosed

On August 18, 2026, two critical vulnerabilities were discovered in libheif, an image format decoder used in Ubuntu systems. CVE-2026-62289 involves an integer underflow in the Fraction constructor, potentially allowing attackers to crash the application, resulting in a denial of service. CVE-2026-62292 is an out-of-bounds read issue affecting Ubuntu 25.10, which can also lead to a crash and denial of service. Both vulnerabilities were confirmed by Ubuntu and necessitate immediate updates to mitigate risks. Affected versions include libheif in Ubuntu 25.10 and earlier versions. Users are advised to perform a standard system update to secure their systems. The vulnerabilities pose a significant risk, especially for users of the affected Ubuntu versions.

Key Points: • Two critical vulnerabilities in libheif could lead to denial of service attacks. • CVE-2026-62289 and CVE-2026-62292 were published on August 18, 2026. • Affected systems include Ubuntu 25.10 and earlier; updates are required to mitigate risks.