{"id":"AZL-111539","summary":"CVE-2026-119197 affecting package python-pyasn1 0.4.8-3","details":"pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.5, binary REAL decoding builds a large mantissa one octet at a time by shifting a growing integer and slicing the remaining byte string. Attacker-controlled ASN.1 includes a binary-encoded REAL with a large mantissa and reaches BER, CER, or DER decode(), with or without a schema containing REAL. RealPayloadDecoder.valueDecoder repeatedly performs a left shift, OR, and suffix copy for every mantissa octet, making decode time quadratic in mantissa length. A comparatively small REAL value can hold a decoding worker on one CPU core for seconds or longer and cause availability loss. This issue is fixed in version 0.6.5.","modified":"2026-10-30T14:17:30.063560750Z","published":"2026-10-29T20:17:30Z","upstream":["CVE-2026-119197"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119197"}],"affected":[{"package":{"name":"python-pyasn1","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/python-pyasn1"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.4.8-3"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-111539.json"}}],"schema_version":"1.9.2"}