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ESB-2026.3136 PUBLISHED CVSS 7.5 HIGH

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.3136 USN-8134-1: pyasn1 vulnerabilities 31 March 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: pyasn1 Publisher: Ubuntu Operating System: Ubuntu Resolution: Patch/Upgrade CVE Names: CVE-2026-23490 CVE-2026-30922 Original Bulletin: https://ubuntu.com/security/notices/USN-8134-1 Comment: CVSS (Max): 7.5 CVE-2026-30922 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVSS Source: Ubuntu Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H EPSS (Max): 0.0% (15th) CVE-2026-30922 2026-03-30 - --------------------------BEGIN INCLUDED TEXT-------------------- USN-8134-1: pyasn1 vulnerabilities Publication date 30 March 2026 Overview Several security issues were fixed in pyasn1. Releases 20.04 LTS 18.04 LTS 16.04 LTS 14.04 LTS --------------------------------------------------------------------------------- Open side navigation Packages o pyasn1 - ASN.1 library for Python Details It was discovered that pyasn1 could exhaust system resources when attempting to decode a malformed certificate. An attacker could possibly use this to cause a denial of service. ( CVE-2026-23490 ) Kevin Tu discovered that pyasn1 could exhaust system resources via uncontrolled recursion when attempting to decode malicously-crafted certificates. An attacker could possibly use this to cause a denial of service. ( CVE-2026-30922 ) Update instructions The problem can be corrected by updating your system to the following package versions: Ubuntu Package Version Release pypy-pyasn1 - 0.4.2-3ubuntu0.20.04.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro . 20.04 LTS python-pyasn1 - 0.4.2-3ubuntu0.20.04.1~esm1 Ubuntu Pro Fix available focal with Ubuntu Pro . python3-pyasn1 - 0.4.2-3ubuntu0.20.04.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro . pypy-pyasn1 - 0.4.2-3ubuntu0.18.04.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro . 18.04 LTS python-pyasn1 - 0.4.2-3ubuntu0.18.04.1~esm1 Ubuntu Pro Fix available bionic with Ubuntu Pro . python3-pyasn1 - 0.4.2-3ubuntu0.18.04.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro . pypy-pyasn1 - 0.1.9-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro . 16.04 LTS python-pyasn1 - 0.1.9-1ubuntu0.1~esm1 Ubuntu Pro Fix available with xenial Ubuntu Pro . python3-pyasn1 - 0.1.9-1ubuntu0.1~esm1 Ubuntu Pro Fix available with Ubuntu Pro . python-pyasn1 - 0.1.7-1ubuntu2.1+esm1 Ubuntu Pro Fix available with 14.04 LTS Ubuntu Pro via Legacy Support add-on. trusty python3-pyasn1 - 0.1.7-1ubuntu2.1+esm1 Ubuntu Pro Fix available with Ubuntu Pro via Legacy Support add-on. --------------------------------------------------------------------------------- References o CVE-2026-30922 o CVE-2026-23490 Related notices o USN-8129-1 o USN-7975-1 - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================

Risk Scores

CVSS v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products

VendorProductVersions
Ubuntupyasn1

Timeline

References

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