Skip to main content
HIGH

CVE-2026-23490

CVSS v3

7.5

HIGH

EPSS Score

0.8 %

exploit probability, as of 2026-10-17

CISA KEV

No

known exploited

Exploitation

—

SSVC status

Get an alert for each new CVE published for pyasn1. Watch pyasn1 in CVE Watch Free account · no credit card

Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • pyasn1PyPIfrom 0.6.1 · fixed in 0.6.2
  • fence-agents-apcAlmaLinux:10all versions · fixed in 4.16.0-13.el10_1.2and 35 other packages
  • fence-agents-apcAlmaLinux:8all versions · fixed in 4.2.1-129.el8_10.21and 47 other packages
  • fence-virtdAlmaLinux:9all versions · fixed in 4.10.0-98.el9_7.5and 55 other packages
  • python3-pyasn1AlmaLinux:10all versions · fixed in 0.6.2-1.el10_1and 1 other package
  • python3-pyasn1AlmaLinux:9all versions · fixed in 0.4.8-7.el9_7and 1 other package
  • python3-pyasn1AlmaLinux:8all versions · fixed in 0.3.7-6.el8_10.1and 1 other package
  • resource-agentsAlmaLinux:8all versions · fixed in 4.9.0-54.el8_10.28and 3 other packages

Vendor advisories

  • CVE-2026-23490 Red Hat Product Security1,851 products fixed · 26 known affected

    pyasn1: pyasn1: Denial of Service due to memory exhaustion from malformed RELATIVE-OID

    lightspeed-core/dataverse-exporter-rhel9 as a component of Lightspeed Core · lightspeed-core/lightspeed-stack-rhel9 as a component of Lightspeed Core · rhmtc/openshift-migration-rhel8-operator as a component of Migration Toolkit for Containers

  • RHSA-2026:73987 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: RHOAI 3.3.7 - Red Hat OpenShift AI

  • RHSA-2026:54757 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat OpenStack Platform 16.2 security advisory

  • RHSA-2026:42644 Red Hat Product Security33 products fixed

    Red Hat Security Advisory: RHOAI 2.25.9 - Red Hat OpenShift AI

  • RHSA-2026:41928 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat Migration Toolkit for Containers

  • RHSA-2026:39894 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Release of containers for RHOSO 18.0.21

49 more advisories

Full record on NVD

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2026-01-16
Last Modified
2026-08-14

Frequently asked questions

What is CVE-2026-23490?

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.

Is CVE-2026-23490 actively exploited?

Active exploitation of CVE-2026-23490 has not been confirmed. Its EPSS score was 0.8% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-23490?

CVE-2026-23490 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Running pyasn1? Hear about its next vulnerability

CVE Watch matches each new CVE to the vendors and products you list (vendor and product, not the version) and puts it in your alerts with its KEV and EPSS status.

Get alerts for this productCISA KEV additions, October 2026Search CVEs

Already have an account? Open CVE WatchNo credit card required · 50 free checks/month · Free API key

Go further

Related vulnerabilities

Same product first, then the same vendor advisory and the same publication week.

Back to CVE Database