Multiple vulnerabilities in the pyasn1 library affect various Ubuntu LTS releases, allowing denial of service via excessive CPU or memory consumption when decoding untrusted ASN.1 data. These issues include improper bounding of long-form tag identifiers, quadratic time processing of OBJECT IDENTIFIER and RELATIVE-OID values, incorrect REAL value conversions, and inefficient handling of fragmented constructed strings and BIT STRING values. The vulnerabilities impact Ubuntu 14.04 LTS through 26.10, with fixes available in updated package versions.