{"id":"CVE-2026-30922","summary":"pyasn1 Vulnerable to Denial of Service via Unbounded Recursion","details":"pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.3, the `pyasn1` library is vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can supply a crafted payload containing thousands of nested `SEQUENCE` (`0x30`) or `SET` (`0x31`) tags with \"Indefinite Length\" (`0x80`) markers. This forces the decoder to recursively call itself until the Python interpreter crashes with a `RecursionError` or consumes all available memory (OOM), crashing the host application. This is a distinct vulnerability from CVE-2026-23490 (which addressed integer overflows in OID decoding). The fix for CVE-2026-23490 (`MAX_OID_ARC_CONTINUATION_OCTETS`) does not mitigate this recursion issue. Version 0.6.3 fixes this specific issue.","aliases":["GHSA-jr27-m4p2-rc6r"],"modified":"2026-04-06T17:59:11.489397923Z","published":"2026-03-18T02:29:45.857Z","related":["CGA-hmg3-xp5x-p9q9","MGASA-2026-0087","SUSE-SU-2026:1075-1","SUSE-SU-2026:1076-1","SUSE-SU-2026:1158-1","SUSE-SU-2026:20821-1","SUSE-SU-2026:20835-1","SUSE-SU-2026:20878-1","SUSE-SU-2026:20929-1","openSUSE-SU-2026:10393-1","openSUSE-SU-2026:20418-1"],"database_specific":{"cwe_ids":["CWE-674"],"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30922.json"},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/03/20/4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/30xxx/CVE-2026-30922.json"},{"type":"ADVISORY","url":"https://github.com/pyasn1/pyasn1/security/advisories/GHSA-jr27-m4p2-rc6r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-30922"},{"type":"FIX","url":"https://github.com/pyasn1/pyasn1/commit/25ad481c19fdb006e20485ef3fc2e5b3eff30ef0"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/pyasn1/pyasn1","events":[{"introduced":"0"},{"fixed":"af65c3b92e9deeae50db4de390982dd970d87f98"}]}],"versions":["0.2.3","v0.2.1","v0.2.2","v0.3.1","v0.3.2","v0.3.3","v0.3.4","v0.3.5","v0.3.6","v0.3.7","v0.4.1","v0.4.2","v0.4.3","v0.4.4","v0.4.5","v0.4.6","v0.4.7","v0.4.8","v0.5.0","v0.5.1","v0.6.0","v0.6.1","v0.6.2"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-30922.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}