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CVE-2026-23490VulnerabilityPublished Updated

Red Hat Security Advisory: python-pyasn1 security update

Affects Red Hat python-pyasn1Source GCVE Database

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Not known to be exploited.

Data as of 31 Oct 2026, 20:20 UTC

Severity
High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
0.7% chance of exploitation in 30 days – higher than 55% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Mar 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.

What to do

AI-suggested

Red Hat has released an updated python-pyasn1 package to address this vulnerability. Users of Red Hat Enterprise Linux 8.2 Advanced Update Support should apply the security update as described in Red Hat advisory RHSA-2026:4145 and the referenced article https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official patch.

Description

A denial of service vulnerability exists in the python-pyasn1 library due to memory exhaustion caused by malformed RELATIVE-OID input. This issue affects Red Hat Enterprise Linux 8.2 Advanced Update Support. The vulnerability is identified as CVE-2026-23490 and has been rated as having an important security impact by Red Hat. A security update is available to address this issue.

References

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