Protection Mechanism Failure Affecting org.asynchttpclient:async-http-client package, versions [2.1.0,3.0.14)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published8 Oct 2026
- disclosed8 Oct 2026
- creditUnknown
Introduced: 8 Oct 2026
NewCVE-2026-107226 (opens in a new tab)How to fix?
Upgrade org.asynchttpclient:async-http-client to version 3.0.14 or higher.
Overview
org.asynchttpclient:async-http-client is a maven plugin for the Async Http Client (AHC) classes.
Affected versions of this package are vulnerable to Protection Mechanism Failure due to improper handling of the scheme when processing Set-Cookie headers. An attacker can overwrite, plant, or delete secure cookies by sending crafted HTTP responses over plaintext connections, which can result in session fixation, CSRF token manipulation, or removal of critical cookies. This is only exploitable if a plaintext host under the same site is able to set cookies for the target domain.
Workaround
This vulnerability can be mitigated by not sharing one CookieStore between plaintext and HTTPS origins that are not mutually trusted, or by disabling the cookie store.