Debian dla-4463 : pypy-pyasn1 - security update

high Nessus Plugin ID 297504

Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4463 advisory.

- ----------------------------------------------------------------------- Debian LTS Advisory DLA-4463-1 [email protected] https://www.debian.org/lts/security/ Utkarsh Gupta February 01, 2026 https://wiki.debian.org/LTS
- -----------------------------------------------------------------------

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

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 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/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

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade the pypy-pyasn1 packages.

Plugin Details

Severity: High

ID: 297504

File Name: debian_DLA-4463.nasl

Version: 1.1

Type: local

Agent: unix

Family: Debian Local Security Checks

Published: 2/1/2026

Updated: 2/1/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-23490

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:python-pyasn1-doc, p-cpe:/a:debian:debian_linux:python3-pyasn1, p-cpe:/a:debian:debian_linux:pypy-pyasn1

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 2/1/2026

Vulnerability Publication Date: 1/16/2026

Reference Information

CVE: CVE-2026-23490

Detections

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