Vulnerability in Asynchttpclient Async-Http-Client
CVE-2026-107226
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 2.1.0 until 3.0.14, the default ThreadSafeCookieStore does not retain whether a Set-Cookie response used a secure transport. It accepts Secure cookies received over plaintext and permits insecure cookies to overlay or delete existing Secure cookies with matching scope. An attacker controlling a plaintext same-site response can consequently plant, replace, or remove cookie state later sent to an HTTPS origin, enabling session fixation, CSRF-token replacement, or loss of security-relevant state. This issue is fixed in version 3.0.14.
Published .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Asynchttpclient Async-Http-Client — versions >= 2.1.0, <= 2.16.1, >= 3.0.0, < 3.0.14
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-107226?
- CVE-2026-107226 is a medium-severity vulnerability in Asynchttpclient Async-Http-Client, classified under Session Fixation. CVSS score: 6.8/10. Published 2026-10-12.
- How severe is CVE-2026-107226?
- Medium severity. CVSS v3 base score is 6.8 out of 10.