CVE-2026-107232AsyncHttpClient: Origin credentials sent in cleartext to a proxy that rejects the CONNECT
- 7.5HighCVSS base score
- 0.21%Exploitation in 30 daysEPSS · top 88% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 on 3.x and 2.16.1 on 2.x, the client infers that an HTTP proxy tunnel exists from the last request method rather than the CONNECT result. After a proxy rejects CONNECT, redirect or authentication handlers can write an origin request and its Authorization credentials onto the still-plaintext proxy connection. Basic credentials can be recovered directly, while NTLM responses may be cracked or relayed. This issue is fixed in versions 3.0.12 and 2.16.1.
Timeline
ID reserved
By GitHub_M
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVDNVD · Awaiting Analysis | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.21% · top 88% of all CVEs (15 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
AsyncHttpClient · async-http-client
- affected >= 3.0.0, < 3.0.12
- affected >= 2.0.0, < 2.16.1
References
References5
- https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-v9f2-7rw2-gr2x (opens in a new tab)x_refsource_CONFIRM
- https://github.com/AsyncHttpClient/async-http-client/commit/3a625cb892233c0a6653ac68823a25ffbc80f393 (opens in a new tab)x_refsource_MISC
- https://github.com/AsyncHttpClient/async-http-client/commit/a87e7b8c81a6f66a4ce23cd43097fbadd1c788ea (opens in a new tab)x_refsource_MISC
- https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1 (opens in a new tab)x_refsource_MISC
- https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-94637 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-107232)Record last updated .