{"id":"DEBIAN-CVE-2026-119196","details":"pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.5, constructed BIT STRING decoding repeatedly shifts and copies the complete bit value accumulated from earlier fragments. Attacker-controlled BER or CER input contains many constructed BIT STRING fragments; schema-driven DER also accepts a definite-length constructed BIT STRING. BitStringPayloadDecoder repeatedly calls BitString.fromOctetString with the prior bitString as prepend, shifting an ever-growing SizedInteger for each fragment and causing quadratic work. Large fragmented values can exhaust CPU during decode() without requiring later conversion or formatting. This issue is fixed in version 0.6.5.","modified":"2026-10-30T09:00:07.090171616Z","published":"2026-10-29T20:17:30.770Z","upstream":["CVE-2026-119196"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-119196"}],"affected":[{"package":{"name":"pyasn1","ecosystem":"Debian:12","purl":"pkg:deb/debian/pyasn1?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4.8-3","0.4.8-3+deb12u1","0.4.8-3+deb12u2","0.4.8-3+deb12u3","0.4.8-4","0.5.1-1","0.6.0-1","0.6.1-1","0.6.2-1","0.6.2-1~bpo13+1","0.6.3-1","0.6.4-1","0.6.4-1~bpo13+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-119196.json"}},{"package":{"name":"pyasn1","ecosystem":"Debian:13","purl":"pkg:deb/debian/pyasn1?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.1-1","0.6.1-1+deb13u1","0.6.1-1+deb13u2","0.6.1-1+deb13u3","0.6.2-1","0.6.2-1~bpo13+1","0.6.3-1","0.6.4-1","0.6.4-1~bpo13+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-119196.json"}},{"package":{"name":"pyasn1","ecosystem":"Debian:14","purl":"pkg:deb/debian/pyasn1?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.6.1-1","0.6.2-1","0.6.2-1~bpo13+1","0.6.3-1","0.6.4-1","0.6.4-1~bpo13+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-119196.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}