Denial of Service Vulnerabilities in pyasn1 Library

Multiple vulnerabilities were discovered in the pyasn1 library, affecting applications that decode untrusted ASN.1 data. Specifically, CVE-2026-59884 allows for excessive CPU consumption due to improper size bounding of long-form tag identifiers. CVE-2026-59885 highlights quadratic processing time for OBJECT IDENTIFIER and RELATIVE-OID values, also leading to potential denial of service. Additionally, CVE-2026-59886 involves incorrect conversion of REAL values to Python float types, which can cause high CPU and memory usage. These vulnerabilities could be exploited by attackers to disrupt services. The affected systems include Ubuntu 26.04 LTS and earlier versions. Users are advised to update their systems to mitigate these risks. The vulnerabilities were published on July 14, 2026, and patches are available.

Key Points: • Three critical vulnerabilities in pyasn1 library identified. • Denial of service risks due to excessive CPU and memory consumption. • Patches available for affected Ubuntu versions.