CVE-2026-23490 - Vulnerability Details - OpenCVE

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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation poc

Automatable yes

Technical Impact partial

No data.

No data.

No data.

No data.

Advisories

Source	ID	Title
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.

References

Link	Providers
https://github.com/pyasn1/pyasn1/commit/3908f144229eed4df24bd569d16e5991ace44970
https://github.com/pyasn1/pyasn1/releases/tag/v0.6.2
https://github.com/pyasn1/pyasn1/security/advisories/GHSA-63vm-454h-vhhq

History

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		https://github.com/pyasn1/pyasn1/commit/3908f144229eed4df24bd569d16e5991ace44970 https://github.com/pyasn1/pyasn1/releases/tag/v0.6.2 https://github.com/pyasn1/pyasn1/security/advisories/GHSA-63vm-454h-vhhq
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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MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-01-16T19:03:36.442Z

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

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

Link: CVE-2026-23490

Vulnrichment

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

NVD

Status : Received

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

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

Link: CVE-2026-23490

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-770

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