CVE-2026-55688
MEDIUMDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
TridentStack Control tracks known vulnerabilities across your Windows, macOS, and Linux fleet and shows the fix as soon as one is published. See how it works
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Exploit Intelligence
Low risk: more likely to be exploited than 8% of all known CVEs.
References
Related Vulnerabilities
Other CWE-1275 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2024-6611 | Critical | 9.8 | 0.7% | - | Fix |
| CVE-2023-53957 | Critical | 9.8 | 0.5% | - | - |
| CVE-2022-38386 | Medium | 5.9 | 0.5% | - | - |
| CVE-2025-36134 | Low | 3.7 | 0.3% | - | Fix |
| CVE-2024-43173 | Low | 3.7 | 0.2% | - | - |
| CVE-2024-30155 | Medium | 5.5 | 0.2% | - | - |
Embed a live status badge for CVE-2026-55688
Markdown
[](https://tridentstack.com/cve/CVE-2026-55688)HTML
<a href="https://tridentstack.com/cve/CVE-2026-55688"><img src="https://tridentstack.com/cve/badge/CVE-2026-55688.svg" alt="CVE-2026-55688"></a>Find and fix vulnerabilities across your fleet
TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-02.