CVE-2026-23490

HIGH

pyasn1 < 0.6.2 - Denial of Service via Malformed RELATIVE-OID

Title source: llm

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.

References (4)

Core 4

Core References

Vendor Advisory x_refsource_confirm

https://github.com/pyasn1/pyasn1/security/advisories/GHSA-63vm-454h-vhhq

Patch x_refsource_misc

https://github.com/pyasn1/pyasn1/commit/3908f144229eed4df24bd569d16e5991ace44970

View Patch ZIP pw:eip

Release Notes x_refsource_misc

https://github.com/pyasn1/pyasn1/releases/tag/v0.6.2

Mailing List

https://lists.debian.org/debian-lts-announce/2026/02/msg00002.html

Scores

CVSS v3 7.5

EPSS 0.0049

EPSS Percentile 38.2%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

CWE

CWE-770

Status published

Products (3)

debian/debian_linux 11.0

pyasn1/pyasn1 < 0.6.2

pypi/pyasn1 0.6.1 - 0.6.2PyPI

Published Jan 16, 2026

Tracked Since Feb 18, 2026