AsyncHttpClient accepts cookies for public suffixes such as co.uk
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · None
- Fix status
- Partial Red Hat: 1 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
AsyncHttpClient (async-http-client) from 3.0.0 before 3.0.13 and from 2.0.0 before 2.16.1 validates cookie Domain attributes without rejecting public suffixes. A host beneath a suffix such as co.uk can set a cookie for that suffix, and the shared cookie store then sends it to unrelated hosts under that suffix. This CWE-1275 flaw lets an attacker inject or overwrite session-relevant cookie values across origins.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| AsyncHttpClient | async-http-client | 3.0.0 to before 3.0.13; 2.0.0 to before 2.16.1 | 3.0.13, 2.16.1 | Patch available | CNA |
| — | org.asynchttpclient:async-http-client (Maven) | 3.0.0 to before 3.0.13 | 3.0.13 | Patch available | GHSA-f9m8-cv68-674w |
| — | org.asynchttpclient:async-http-client (Maven) | 2.0.0 to before 2.16.1 | 2.16.1 | Patch available | GHSA-f9m8-cv68-674w |
- async-http-client VendorAsyncHttpClient Affected 3.0.0 to before 3.0.13; 2.0.0 to before 2.16.1 Fixed in 3.0.13, 2.16.1 Patch available CNA
- org.asynchttpclient:async-http-client (Maven) Vendor— Affected 3.0.0 to before 3.0.13 Fixed in 3.0.13 Patch available GHSA-f9m8-cv68-674w
- org.asynchttpclient:async-http-client (Maven) Vendor— Affected 2.0.0 to before 2.16.1 Fixed in 2.16.1 Patch available GHSA-f9m8-cv68-674w
Remediation
Upgrade async-http-client to version 3.0.13 in the 3.x line or to version 2.16.1 in the 2.x line. Red Hat Fuse 7 is listed as affected with no fix planned.
Written with Claude Haiku 5.5 from the sources below · 2026-11-03
- Fix · CNA async-http-client (AsyncHttpClient) Fixed in 3.0.13, 2.16.1
- Fix · GHSA-f9m8-cv68-674w org.asynchttpclient:async-http-client (Maven) Fixed in 3.0.13 Advisory →
- Fix · GHSA-f9m8-cv68-674w org.asynchttpclient:async-http-client (Maven) Fixed in 2.16.1 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Fuse 7 | Affected | No fix planned: Out of support scope |
Timeline
- 2026-10-07 Threatist record created from CVE-2026-107280
- 2026-10-08 Alias added: GHSA-f9m8-cv68-674w
- 2026-10-08 Fix available: Maven/org.asynchttpclient:[email protected], Maven/org.asynchttpclient:[email protected] · GHSA-f9m8-cv68-674w
- 2026-10-08 CVSS score added · GHSA-f9m8-cv68-674w
- 2026-10-08 Weakness changed · GHSA-f9m8-cv68-674w
- 2026-10-08 7 new references · GHSA-f9m8-cv68-674w
- 2026-10-08 CISA SSVC decision points changed
- 2026-10-08 Priority changed: MEDIUM → LOW
- 2026-11-03 Affected versions changed · Red Hat
- 2026-11-03 CVSS score added · Red Hat
References
Other 6
- https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-f9m8-cv68-674w
- https://github.com/AsyncHttpClient/async-http-client/commit/330267895fe0bdb41bbd027ea6b151d38ee7c23d
- https://github.com/AsyncHttpClient/async-http-client/commit/d1f0ccec417092098d40242fee7dfac84bb3c21f
- https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1
- https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.13
- https://github.com/AsyncHttpClient/async-http-client
More AsyncHttpClient vulnerabilities
- TI-2024-36149 AsyncHttpClient (AHC) library's `CookieStore` replaces explicitly defined `Cookie`s CVSS 4.0CRITICAL 9.2
- TI-2026-69321 Cross-host replay in AsyncHttpClient leaks credentials to new host CVSS 4.0CRITICAL 9.4
- TI-2026-69315 AsyncHttpClient sends passwords in cleartext after Digest downgrade CVSS 4.0HIGH 8.7
- TI-2026-58825 AsyncHttpClient: Unbounded HTTP/1.1 response decompression enables a decompression-bomb denial of service CVSS 3.1HIGH 7.5
- TI-2026-69311 Unbounded WebSocket decompression in AsyncHttpClient enables DoS CVSS 3.1HIGH 7.5
- TI-2026-58823 AsyncHttpClient: SOCKS proxy credentials sent to the origin server over plaintext HTTP CVSS 3.1HIGH 7.5
Sources
- CVE-2026-107280 · CVE Program
- CVE-2026-107280 · NVD
- FIRST EPSS
- GHSA-f9m8-cv68-674w · GitHub Advisory Database · CC BY 4.0
- CVE-2026-107280 · Red Hat security data · CC BY 4.0
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