CVE catalog
CVE-2026-55688
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. In versions from 2.0.0 prior to 2.16.0 and from 3.0.0.Beta1 prior
- Severity
- Medium · CVSS 4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.33% · Oct 25, 2026
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. In versions from 2.0.0 prior to 2.16.0 and from 3.0.0.Beta1 prior to 3.0.11, 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, leading to a cookie tossing / cookie injection issue. A host the client connects to can therefore plant a cookie scoped to an unrelated domain, and the client will then send that cookie on later requests to that domain. Applications that use a single AsyncHttpClient instance - and thus the default, shared CookieStore - to reach both an attacker-influenced host and a trusted host are impacted. This issue has been fixed in versions 2.16.0 and 3.0.11.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | async-http-client | sid | 2.12.3-1 | vulnerable |
| Debian | async-http-client | bookworm | 2.12.3-1 | vulnerable |
| Debian | async-http-client | bookworm-security | 2.12.3-1+deb12u1 | fixed |
| Cpe | async-http-client | Not reported | Not reported | vulnerable |
| Maven | org.asynchttpclient:async-http-client | Not reported | 2.16.0 | fixed |
| Ubuntu | async-http-client | noble | 2.12.3-1ubuntu0.24.04.1 | fixed |
| Ubuntu | libasync-http-client-java | noble | 2.12.3-1ubuntu0.24.04.1 | fixed |
| Ubuntu | async-http-client | pro | 2.6.0-1 | vulnerable |
| Ubuntu | async-http-client | pro | 2.6.0-1ubuntu0.1~esm1 | fixed |
| Ubuntu | async-http-client | 22.04 | 2.12.2-1 | vulnerable |
| Ubuntu | async-http-client | 22.04 | 2.12.3-1 | vulnerable |
| Ubuntu | async-http-client | 22.04 | 2.12.3-1ubuntu0.22.04.1 | fixed |
| Ubuntu | async-http-client | 24.04 | 2.12.3-1 | vulnerable |
| Ubuntu | async-http-client | 24.04 | 2.12.3-1ubuntu0.24.04.1 | fixed |
| Ubuntu | async-http-client | 26.04 | 2.12.3-1 | vulnerable |
| Ubuntu | async-http-client | 26.04 | 2.12.3-1ubuntu1 | vulnerable |
| Ubuntu | async-http-client | 26.04 | 2.12.3-1ubuntu1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | async-http-client | source | sid | (unfixed) | not yet assigned | Not reported | [1141445] |
| Debian | async-http-client | source | bookworm | 2.12.3-1+deb12u1 | not yet assigned | Not reported | [1141445] |
| Maven | org.asynchttpclient:async-http-client | maven | Not reported | 2.16.0 | Not reported | GHSA-M452-Q8C9-RG2F | Not reported |
| Ubuntu | async-http-client | deb | noble | 2.12.3-1ubuntu0.24.04.1 | Not reported | Not reported | Not reported |
| Ubuntu | libasync-http-client-java | deb | noble | 2.12.3-1ubuntu0.24.04.1 | Not reported | Not reported | Not reported |
| Ubuntu | async-http-client | deb | pro | 2.6.0-1ubuntu0.1~esm1 | Not reported | USN-8655-1 | Not reported |
| Ubuntu | async-http-client | deb | 22.04 | 2.12.3-1ubuntu0.22.04.1 | Not reported | USN-8655-1 | Not reported |
| Ubuntu | async-http-client | deb | 24.04 | 2.12.3-1ubuntu0.24.04.1 | Not reported | USN-8655-1 | Not reported |
| Ubuntu | async-http-client | deb | 26.04 | 2.12.3-1ubuntu1.1 | Not reported | USN-8655-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libasync-http-client-java]Affected
Source package: [async-http-client]
Details (4)
2.12.3-1· all · bookwormAffected · Fixed:
2.12.3-1+deb12u1nvd · async-http-client · debian · bookworm; nvd · async-http-client · debian · 12
2.12.3-1· all · bookwormAffected · Fixed:
2.12.3-1+deb12u1nvd · async-http-client · debian · bookworm; nvd · async-http-client · debian · 12
2.12.3-1+deb12u1· all · bookworm-securityFixed · Fixed:
2.12.3-1+deb12u1nvd · async-http-client · debian · bookworm; nvd · async-http-client · debian · 12
2.12.3-1+deb12u1· all · bookworm-securityFixed · Fixed:
2.12.3-1+deb12u1nvd · async-http-client · debian · bookworm; nvd · async-http-client · debian · 12
Observed:
References
- [https://github.com/AsyncHttpClient/async-http-client/pull/2196]
- [https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-m452-q8c9-rg2f]
- [https://github.com/advisories/GHSA-m452-q8c9-rg2f]
- [https://lists.debian.org/debian-lts-announce/2026/08/msg00011.html]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-55688]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-55688]
- [https://osv.dev/vulnerability/USN-8655-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-55688]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55688.json]
- [https://ubuntu.com/security/notices/USN-8655-1]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [Ubuntu Security Notices (USN)]