{"action":"Upgrade pyasn1 to 0.6.4 or later.","affected":[{"fixed":"0.6.4","introduced":"0"}],"component":"pyasn1","cve_ids":["CVE-2026-59884"],"ecosystem":"PyPI","epss":0.00616,"exploited":false,"fixed_versions":["0.6.4"],"ghsa_id":"GHSA-m4p7-r5rc-7g4j","id":"tcs_01M5KH5E0A8HD0FV9GZVF69TWJ","modified_at":"2026-07-22T11:00:08.839373736Z","published_at":"2026-07-14T17:17:14.750Z","references":["https://osv.dev/vulnerability/PYSEC-2026-3455","https://github.com/pyasn1/pyasn1/releases/tag/v0.6.4","https://github.com/pyasn1/pyasn1/security/advisories/GHSA-m4p7-r5rc-7g4j","https://github.com/pyasn1/pyasn1/commit/628e36ecbb5277a3f01572ce418ef54271b165a5"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"PYSEC-2026-3455","url":"https://osv.dev/vulnerability/PYSEC-2026-3455"}],"summary":"pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER decoder shared by the CER and DER codecs parses long-form tags by accumulating continuation octets without an upper bound on the t"}