ESB-2026.4592

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4592 pyasn1 security update 5 May 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: pyasn1 Publisher: Debian Operating System: Debian GNU/Linux Resolution: Patch/Upgrade CVE Names: CVE-2026-30922 Original Bulletin: https://lists.debian.org/debian-lts-announce/2026/05/msg00001.html 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: GitHub 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% (7th) CVE-2026-30922 2026-05-04 - --------------------------BEGIN INCLUDED TEXT-------------------- ------------------------------------------------------------------------- Debian LTS Advisory DLA-4557-1 debian-lts@lists.debian.org https://www.debian.org/lts/security/ Emmanuel Arias May 01, 2026 https://wiki.debian.org/LTS ------------------------------------------------------------------------- Package : pyasn1 Version : 0.4.8-1+deb11u2 CVE ID : CVE-2026-30922 Debian Bug : 1131371 It was discovered that pyasn1, a generic ASN.1 library for Python, is vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. This vulnerability can force the decoder to recursively call itself until the Python interpreter crashes with a `RecursionError` or consumes all available memory, crashing the host application. For Debian 11 bullseye, this problem has been fixed in version 0.4.8-1+deb11u2. We recommend that you upgrade your pyasn1 packages. For the detailed security status of pyasn1 please refer to its security tracker page at: https://security-tracker.debian.org/tracker/pyasn1 Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS - --------------------------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 ===========================================================================