Debian dla-4721 : libasync-http-client-java - security update

medium Nessus Plugin ID 333111

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Synopsis

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

Description

The remote Debian 11 / 12 host has a package installed that is affected by a vulnerability as referenced in the dla-4721 advisory.

- ------------------------------------------------------------------------- Debian LTS Advisory DLA-4721-1 [email protected] https://www.debian.org/lts/security/ Chris Lamb August 06, 2026 https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : async-http-client Version : 2.12.2-1+deb11u1 CVE ID : CVE-2026-55688 Debian Bug : 1141445

It was discovered that there was a potential cookie injection vulnerability in async-http-client, Java library used to make asynchronous HTTP requests.

CVE-2026-55688

Prevent a potential cookie injection or cookie tossing vulnerability. ThreadSafeCookieStore stored a cookie under the value of its Domain attribute, without verifying that the responding host is allowed to set a cookie for that domain, therefore leading to cookie tossing/injection issues.

For Debian 11 bullseye, this problem has been fixed in version 2.12.2-1+deb11u1.

For Debian 12 bookworm, this problem has been fixed in version 2.12.3-1+deb12u1.

We recommend that you upgrade your async-http-client packages.

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

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 libasync-http-client-java packages.

Plugin Details

Severity: Medium

ID: 333111

File Name: debian_DLA-4721.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 8/6/2026

Updated: 8/6/2026

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

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Low

Base Score: 2.6

Temporal Score: 1.9

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

CVSS Score Source: CVE-2026-55688

CVSS v3

Risk Factor: Medium

Base Score: 4

Temporal Score: 3.5

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:libasync-http-client-java

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/6/2026

Vulnerability Publication Date: 7/1/2026

Reference Information

CVE: CVE-2026-55688

Detections

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