Medium severity · published Oct 7, 2026
CVE-2026-107280
AsyncHttpClient: Cookie Domain attribute is not checked against the public suffix list, so a cookie can be set for co.uk
6.9
CVSS
0.3%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
async-http-client · AsyncHttpClient
>= 3.0.0, < 3.0.13; >= 2.0.0, < 2.16.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-107280
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-107280
x_refsource_CONFIRM
https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-f9m8-cv68-674w
x_refsource_MISC
https://github.com/AsyncHttpClient/async-http-client/commit/330267895fe0bdb41bbd027ea6b151d38ee7c23d
x_refsource_MISC
https://github.com/AsyncHttpClient/async-http-client/commit/d1f0ccec417092098d40242fee7dfac84bb3c21f
x_refsource_MISC
https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1
x_refsource_MISC
https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.13
More from async-http-client
9.4
CVE-2026-107282
AsyncHttpClient: Replay to a different host sends the original host request and credentials to the new host
8.8
CVE-2026-107279
AsyncHttpClient: Digest mutual authentication is switched off by a peer offering qop=auth-int
8.7
CVE-2026-107231
AsyncHttpClient: Digest challenge without a usable nonce downgrades to Basic and sends the password in cleartext
7.6
CVE-2026-107281
AsyncHttpClient: Connection pool key omits the authenticated principal, so an NTLM or Negotiate connection is reused across identities
7.5
CVE-2026-107232
AsyncHttpClient: Origin credentials sent in cleartext to a proxy that rejects the CONNECT