CVE-2026-55688
Publication date 1 July 2026
Last updated 26 August 2026
Ubuntu priority
Description
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| async-http-client | 26.04 LTS resolute |
Fixed 2.12.3-1ubuntu1.1
|
| 24.04 LTS noble |
Fixed 2.12.3-1ubuntu0.24.04.1
|
|
| 22.04 LTS jammy |
Fixed 2.12.3-1ubuntu0.22.04.1
|
|
| 20.04 LTS focal |
Fixed 2.6.0-1ubuntu0.1~esm1
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
|
| 14.04 LTS trusty |
Needs evaluation
|
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CVSS version: CVSS v3.0
Base score
4.0 · Medium
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
References
Related Ubuntu Security Notices (USN)
- USN-8655-1
- AsyncHttpClient vulnerability
- 20 August 2026