pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.2, a Denial-of-Service issue has been found that leads to memory exhaustion from malformed RELATIVE-OID with excessive continuation octets. This vulnerability is fixed in 0.6.2.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-63vm-454h-vhhq pyasn1 has a DoS vulnerability in decoder
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 20 Jan 2026 09:15:00 +0900

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Mon, 19 Jan 2026 18:45:00 +0900

Type Values Removed Values Added
First Time appeared Pyasn1
Pyasn1 pyasn1
Vendors & Products Pyasn1
Pyasn1 pyasn1

Sat, 17 Jan 2026 05:15:00 +0900

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sat, 17 Jan 2026 04:15:00 +0900

Type Values Removed Values Added
Description pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.2, a Denial-of-Service issue has been found that leads to memory exhaustion from malformed RELATIVE-OID with excessive continuation octets. This vulnerability is fixed in 0.6.2.
Title pyasn1 has a DoS vulnerability in decoder
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-16T19:23:51.965Z

Reserved: 2026-01-13T15:47:41.628Z

Link: CVE-2026-23490

cve-icon Vulnrichment

Updated: 2026-01-16T19:23:44.563Z

cve-icon NVD

Status : Received

Published: 2026-01-16T19:16:19.117

Modified: 2026-01-16T19:16:19.117

Link: CVE-2026-23490

cve-icon Redhat

Severity : Important

Publid Date: 2026-01-16T19:03:36Z

Links: CVE-2026-23490 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-01-19T18:20:14Z

Weaknesses