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Debian 11 pyasn1 Critical DoS Memory Exhaustion CVE-2026-23490 DLA-4463-1

debian lts
Calendar Grey February 1, 2026
Dist Debian Esm H88
Denial of service fix for pyasn1 in Debian 11 addresses critical memory issue from malformed OID.
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-...
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Topics Covered

security advisory denial of service critical debian pyasn1

Summary

For Debian 11 bullseye, this problem has been fixed in version
0.4.8-1+deb11u1.

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/source-package/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


Severity
critical
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Critical

Package: pyasn1
Version: 0.4.8-1+deb11u1
CVE ID: CVE-2026-23490
Debian Bug: 1125753

Topics%20covered

Topics Covered

security advisory denial of service critical debian pyasn1

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