CVE-2026-23490

Name: CVE-2026-23490
Creator: NVD / NIST
Published: 2026-01-16T19:16:19.117+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.49%

Last modified Jun 17, 2026

CVE-2026-23490 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.49% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.49%

38.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-770

Affected Software

Vendor	Product	Versions
Pyasn1	Pyasn1	< 0.6.2
Debian	Debian Linux	11.0

References

https://github.com/pyasn1/pyasn1/commit/3908f144229eed4df24bd569d16e5991ace44970Patch
https://github.com/pyasn1/pyasn1/releases/tag/v0.6.2Product, Release Notes
https://github.com/pyasn1/pyasn1/security/advisories/GHSA-63vm-454h-vhhqVendor Advisory
https://lists.debian.org/debian-lts-announce/2026/02/msg00002.htmlVendor Advisory

Timeline

Published: Jan 16, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-23490?

How severe is CVE-2026-23490?

CVE-2026-23490 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.49% probability of exploitation in the next 30 days.

How do I fix CVE-2026-23490?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-23490?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST