Debian dla-4778 : python-pyasn1-doc - security update

high Nessus Plugin ID 344388

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 12 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4778 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-4778-1 [email protected] https://www.debian.org/lts/security/ Emmanuel Arias September 09, 2026 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : pyasn1 Version : 0.4.8-3+deb12u3 CVE ID : CVE-2026-59884 CVE-2026-59885 CVE-2026-59886 Debian Bug : 1142388

It was discovered that pyasn1, a generic ASN.1 library for Python, is prone to denial of service vulnerabilities, which may result in excessive CPU and memory consumption

CVE-2026-59884

BER/CER/DER decoder denial of service via unbounded long-form tag IDs. The BER decoder accumulated tag continuation octets without an upper bound, so a crafted substrate could force construction of an arbitrarily large integer with quadratic CPU cost.

CVE-2026-59885

fix quadratic complexity in OBJECT IDENTIFIER and RELATIVE-OID decoding and encoding, which allowed denial of service via a small payload with many arcs.

CVE-2026-59886

uncontrolled resource consumption when converting decoded real values.
univ.Real convertedts mantissa, base, exponens to a Python float using exact big-integer exponentiation, so a real value only a few bytes long could carry a very large exponent.

For Debian 12 bookworm, these problems have been fixed in version 0.4.8-3+deb12u3.

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 these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the python-pyasn1-doc packages.

Plugin Details

Severity: High

ID: 344388

File Name: debian_DLA-4778.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 9/9/2026

Updated: 9/9/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.73

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-2026-59886

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:12.0, p-cpe:/a:debian:debian_linux:python-pyasn1-doc, p-cpe:/a:debian:debian_linux:python3-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: 9/9/2026

Vulnerability Publication Date: 7/14/2026

Reference Information

CVE: CVE-2026-59884, CVE-2026-59885, CVE-2026-59886

Detections

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