ELA-1634-1 pyasn1 security update

denial of service

2026-02-01
Packagepyasn1
Version0.1.9-2+deb9u1 (stretch), 0.4.2-3+deb10u1 (buster)
Related CVEs CVE-2026-23490


It was discovered that pyasn1, a generic ASN.1 library for Python, is prone to a denial of service vulnerability, which may result in memory exhaustion from malformed OID/RELATIVE-OID with excessive continuation octets.



For Debian 10 buster, these problems have been fixed in version 0.4.2-3+deb10u1.

For Debian 9 stretch, these problems have been fixed in version 0.1.9-2+deb9u1.

We recommend that you upgrade your pyasn1 packages.

Further information about Extended LTS security advisories can be found in the dedicated section of our website.