What’s Vulnerable › Vulnerabilities

CVE-2026-107229: AsyncHttpClient: Incomplete origin checks in the default cookie store allow cookie tossing onto public-suffix and IP-address hosts

• Severity: medium (CVSS 4.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-07 · updated 2026-10-08
• Weakness: CWE-384

Description

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 2.16.0 until 3.0.14, ThreadSafeCookieStore incompletely validates cookie Domain attributes. Missing private-section and default public-suffix rules, absent A-label normalization, locale-sensitive lowercasing, public-suffix host-only handling, and numeric or IP host checks allow one origin to store a cookie later sent to another origin. Applications sharing one client across trust domains can therefore receive attacker-injected cookies and may be exposed to session fixation. This issue is fixed in version 3.0.14.

Affected products

• AsyncHttpClient async-http-client: from 3.0.11, < 3.0.14; from 2.16.0, <= 2.16.1

References

• https://github.com/AsyncHttpClient/async-http-client/commit/7dc5bbc2d0a48aa2a9caf089a626dcfd333168e9
• https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.14
• https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-qjr7-w8pj-pmv9

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