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Vulnerability record · CVE-2026-107284 · published 7 October 2026

CVE-2026-107284: Insufficient verification of data authenticity vulnerability

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, WebSocketHandler.upgrade aborts a handshake whose Sec-WebSocket-Accept value is missing or invalid but continues into pipeline installation and onOpen delivery. Frames coalesced with the invalid 101 response can be decoded and delivered from a peer that did not prove the handshake, although the request future fails and the channel closes. This issue is fixed in versions 3.0.12 and 2.16.1.

3.7 CVSS 3.1 Low EPSS 0.14% · top 97.2% CWE-345 · Insufficient verification of data authenticityCWE-670 · CWE-670 Awaiting Analysis
3.7CVSS 3.1 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
8 Oct 2026Last modified by NVD

Description

The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, WebSocketHandler.upgrade aborts a handshake whose Sec-WebSocket-Accept value is missing or invalid but continues into pipeline installation and onOpen delivery. Frames coalesced with the invalid 101 response can be decoded and delivered from a peer that did not prove the handshake, although the request future fails and the channel closes. This issue is fixed in versions 3.0.12 and 2.16.1.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

References

LinkTags
https://github.com/AsyncHttpClient/async-http-client/commit/75a278550aa9a980009d022fb4e635f9c8738c03
https://github.com/AsyncHttpClient/async-http-client/commit/ccdcaa627db6d96dcc42105212cb3ba5048bd7f9
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-3.0.12
https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-rwhr-j9rv-85f8

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Source: NIST National Vulnerability Database (record CVE-2026-107284), CISA KEV, FIRST EPSS (scores of 2026-10-10). This page is refreshed as NVD updates the record.