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.
Published: 2026-01-16
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: Denial of Service via memory exhaustion
Action: Apply Patch
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-4463-1 pyasn1 security update
Debian DSA Debian DSA DSA-6114-1 pyasn1 security update
Github GHSA Github GHSA GHSA-63vm-454h-vhhq pyasn1 has a DoS vulnerability in decoder
Ubuntu USN Ubuntu USN USN-7975-1 pyasn1 vulnerability
Ubuntu USN Ubuntu USN USN-8134-1 pyasn1 vulnerabilities
History

Fri, 13 Mar 2026 14:30:00 +0000

Type Values Removed Values Added
First Time appeared Debian
Debian debian Linux
CPEs cpe:2.3:a:pyasn1:pyasn1:*:*:*:*:*:python:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Vendors & Products Debian
Debian debian Linux

Sun, 01 Feb 2026 17:30:00 +0000

Type Values Removed Values Added
References

Tue, 20 Jan 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 threat_severity

Important

Mon, 19 Jan 2026 09:45:00 +0000

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

Fri, 16 Jan 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

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

Fri, 16 Jan 2026 19:15:00 +0000

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'}

Subscriptions

Debian Debian Linux
Pyasn1 Pyasn1
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-02-01T17:06:14.113Z

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

Link: CVE-2026-23490

cve-icon Vulnrichment

Updated: 2026-02-01T17:06:14.113Z

cve-icon NVD

Status : Analyzed

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

Modified: 2026-03-13T14:19:34.873

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: 2026-04-18T19:15:10Z

Weaknesses