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Debian dla-4557 : pypy-pyasn1 - security update

high Nessus Plugin ID 311489

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-4557 advisory.

 ------------------------------------------------------------------------- Debian LTS Advisory DLA-4557-1 [email protected] 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 Attachment:
 signature.asc Description: PGP signature

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.

See Also

https://security-tracker.debian.org/tracker/source-package/pyasn1

https://packages.debian.org/source/bullseye/pyasn1

https://security-tracker.debian.org/tracker/CVE-2026-30922

Plugin Details

Severity: High

ID: 311489

File Name: debian_DLA-4557.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 5/2/2026

Updated: 5/2/2026

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: 6.1

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

CVSS Score Source: CVE-2026-30922

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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:P/RL:O/RC:C

Vulnerability Information

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

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 5/1/2026

Vulnerability Publication Date: 3/17/2026

Reference Information

CVE: CVE-2026-30922