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fkie_cve-2026-107280

2026-10-11T20:05:41.895369+00:00

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.

GHSA-f9m8-cv68-674w — AsyncHttpClient: Cookie Domain attribute is not checked against the public suffix list, so a cookie can be set for co.uk

2026-10-11T20:05:41.895500+00:00

Affected: Maven: org.asynchttpclient:async-http-client

### Impact The cookie store decides whether a `Domain` attribute may be accepted using only the domain-matching rule of RFC 6265 Section 5.1.3, which asks whether the request host is the domain or ends with a dot followed by it. Section 5.3 step 5, which additionally requires rejecting a `Domain` that is a public suffix, is not implemented anywhere in the client.

So a host under a multi-label public suffix can set a cookie for the suffix itself, and the store then hands it to every other host under that suffix:

``` attacker.co.uk -> Set-Cookie: SID=attacker-value; Domain=co.uk; Path=/ bank.co.uk -> Cookie: SID=attacker-value ```

`Domain=uk` works the same way. The attacker needs only a site under the same suffix as the victim, which for suffixes such as `co.uk`, `com.au`, or `github.io` is trivially obtainable.

Depending on what the application does with the cookie, this is session fixation, or it overwrites a session the victim site set, or it lets the attacker plant a value the victim site trusts.

### Affected versions * 3.x: up to and including 3.0.12 * 2.x: up to and including 2.16.0

### Relationship to CVE-2026-55688 CVE-2026-55688 (GHSA-m452-q8c9-rg2f) covered the direct form of this, where a host sets a `Domain` naming an unrelated host, and that form is genuinely fixed: `attacker.co.uk` can no longer set `Domain=bank.co.uk`, and this was verified as a control. What that fix did not add is the public suffix test, so setting `Domain=co.uk` still reaches `…

UBUNTU-CVE-2026-107280

2026-10-11T20:05:41.895659+00:00

Affected: Ubuntu:Pro:14.04:LTS: async-http-client, Ubuntu:16.04:LTS: async-http-client, Ubuntu:18.04:LTS: async-http-client, Ubuntu:Pro:20.04:LTS: async-http-client, Ubuntu:22.04:LTS: async-http-client, Ubuntu:24.04:LTS: async-http-client, Ubuntu:26.04:LTS: async-http-client