CVE-2026-107280 AsyncHttpClient: Cookie Domain attribute is not checked against the public suffix list, so a cookie can be set for co.uk
Attackers can set cookies for public suffixes like co.uk, allowing cross-origin session hijacking or data injection in Java applications using AsyncHttpClient.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-107280?
CVE-2026-107280 is a medium-severity vulnerability in AsyncHttpClient async-http-client, published on 7 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, ThreadSafeCookieStore validates Domain attributes with domain matching but does not reject public suffixes. A host beneath a suffix such as co.uk can set a cookie for that suffix, after which the shared cookie store sends it to unrelated hosts under the suffix. This can inject or overwrite session-relevant cookie values across origins. This issue is fixed in versions 3.0.13 and 2.16.1.
Weakness: CWE-1275
Which versions are affected by CVE-2026-107280?
4 open source packages ship an affected version, including org.asynchttpclient:async-http-client.
| Package | Affected | Fixed in |
|---|---|---|
org.asynchttpclient:async-http-client Maven | From 2.0.0 | 2.16.1 |
org.asynchttpclient:async-http-client Maven | From 2.0.0 | 2.16.1 |
org.asynchttpclient:async-http-client Maven | From 3.0.0 | 3.0.13 |
org.asynchttpclient:async-http-client Maven | From 3.0.0 | 3.0.13 |
How do I fix CVE-2026-107280?
Upgrade org.asynchttpclient:async-http-client to a fixed version for your release line: 2.16.1 or 3.0.13.
Is CVE-2026-107280 being exploited?
There is no known exploitation of CVE-2026-107280 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-107280, ECHO-9a26-378a-6a12, GHSA-f9m8-cv68-674w, MINI-f8wh-3fx7-f27j, MINI-jhp2-x5rc-855h, MINI-v38v-wgfm-mcq6 and 2 more.