Debian dla-4780 : python-urwid-doc - security update

critical Nessus Plugin ID 345820

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Synopsis

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

Description

The remote Debian 12 host has packages installed that are affected by a vulnerability as referenced in the dla-4780 advisory.

- ------------------------------------------------------------------------- Debian LTS Advisory DLA-4780-1 [email protected] https://www.debian.org/lts/security/ Abhijith PA September 15, 2026 https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : urwid Version : 2.1.2-4+deb12u1 CVE ID : CVE-2026-9323

The urwid web display backend generates web session identifiers by concatenating two random.randrange(10**9) calls that use Python's Mersenne Twister PRNG, which is not cryptographically secure. The same identifier is also used as the filename of a FIFO created in the world-listable /tmp directory, so any local user on the host can list /tmp to enumerate active session tokens directly. With a valid session ID, an attacker can read the victim's terminal screen via the polling endpoint, inject keystrokes into the victim's session, and inject exit sequences or flood the FIFO to terminate or crash the session.

For Debian 12 bookworm, this problem has been fixed in version 2.1.2-4+deb12u1.

We recommend that you upgrade your urwid packages.

For the detailed security status of urwid please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/urwid

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 python-urwid-doc packages.

Plugin Details

Severity: Critical

ID: 345820

File Name: debian_DLA-4780.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 9/15/2026

Updated: 9/15/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.14

CVSS v2

Risk Factor: High

Base Score: 7.6

Temporal Score: 5.6

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

CVSS Score Source: CVE-2026-9323

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.2

Threat Score: 7.2

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:python-urwid-doc, p-cpe:/a:debian:debian_linux:python3-urwid

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/15/2026

Vulnerability Publication Date: 7/18/2026

Reference Information

CVE: CVE-2026-9323

Detections

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