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CVE-2026-23490

pyasn1 has a DoS vulnerability in decoder

Published: Jan 16, 2026Updated: Feb 1, 2026 Sources: CVE List NVD GHSA BDUCWE-770
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.5%
Top 61.8%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-770

Affected Products

pyasn1pyasn1
Library
OSS Libraries / generic-library
pyasn1PyPIOSS Libraries
Red Hat Enterprise LinuxRed Hat Inc.
On-premOS
Operating Systems / linux-distro
Red Hat OpenStack PlatformRed Hat Inc.
On-prem
Cloud & SaaS / cloud-platform
OpenShift Container PlatformRed Hat Inc.
SaaSSaaS Service
Cloud & SaaS / container-orchestration
pyasn1package-ecosystemOSS Libraries
pypipackage-ecosystemOSS Libraries
red hat inc.commercialUSOperating Systemsaka red hat
and 23 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/pyasn1/pyasn1/commit/3908f144229eed4df24bd569d16e5991ace44970
github.com
https://github.com/pyasn1/pyasn1/releases/tag/v0.6.2
github.com
https://github.com/pyasn1/pyasn1/security/advisories/GHSA-63vm-454h-vhhq
github.com
and 10 more references View all →

Timeline

Published
Jan 16, 2026
Last Updated
Feb 1, 2026

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