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DEBIAN-CVE-2026-59885

Type: advisorySource: OSV1 source record

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the BER, CER, and DER decoders process OBJECT IDENTIFIER and RELATIVE-OID values in quadratic time relative to the number of arcs, so a small crafted payload containing an OID with many arcs consumes excessive CPU per decode() call and can deny service to applications that decode untrusted ASN.1 data. The corresponding encoders have the same quadratic behavior when an application re-encodes previously decoded attacker-supplied values. This issue is fixed in version 0.6.4.

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-59885

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-59885

pyasn1

Source reference: /affected/0/package/name

Affected versions
0.4.8-3

Source reference: /affected/0/versions

0.4.8-3+deb12u1

Source reference: /affected/0/versions

0.4.8-3+deb12u2

Source reference: /affected/0/versions

Fixed versions
0.4.8-3+deb12u3

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

pyasn1

Source reference: /affected/1/package/name

Affected versions
0.6.1-1

Source reference: /affected/1/versions

0.6.1-1+deb13u1

Source reference: /affected/1/versions

0.6.1-1+deb13u2

Source reference: /affected/1/versions

Fixed versions
0.6.1-1+deb13u3

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

pyasn1

Source reference: /affected/2/package/name

Affected versions
0.6.1-1

Source reference: /affected/2/versions

0.6.2-1

Source reference: /affected/2/versions

0.6.2-1~bpo13+1

Source reference: /affected/2/versions

0.6.3-1

Source reference: /affected/2/versions

0.6.4-1~bpo13+1

Source reference: /affected/2/versions

Fixed versions
0.6.4-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.4.8-3+deb12u3"
          }
        ]
      }
    ],
    "package": {
      "name": "pyasn1",
      "purl": "pkg:deb/debian/pyasn1?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "0.4.8-3",
      "0.4.8-3+deb12u1",
      "0.4.8-3+deb12u2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59885.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.6.1-1+deb13u3"
          }
        ]
      }
    ],
    "package": {
      "name": "pyasn1",
      "purl": "pkg:deb/debian/pyasn1?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "0.6.1-1",
      "0.6.1-1+deb13u1",
      "0.6.1-1+deb13u2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59885.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "0.6.4-1"
          }
        ]
      }
    ],
    "package": {
      "name": "pyasn1",
      "purl": "pkg:deb/debian/pyasn1?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "0.6.1-1",
      "0.6.2-1",
      "0.6.2-1~bpo13+1",
      "0.6.3-1",
      "0.6.4-1~bpo13+1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59885.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#58047 · Revision 1
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Publisher date
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