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CVE-2026-107230 is a high-severity security flaw residing within the AsyncHttpClient library across versions ranging from 2.0.0 up to and including 2.16.1.
The vulnerability is fundamentally triggered under specialized networking architectures and configuration settings.
Specifically, it manifests when applications utilize advanced authentication protocols such as NTLM, Kerberos, or SPNEGO.
Alternatively, it is triggered when traffic is routed through authentication-requiring SOCKS or HTTP CONNECT proxies.
The core underlying mechanism involves connection pooling and client instance reuse across distinct execution contexts.
When a single shared client instance dispatches multiple requests under different user identities or sessions, internal state mismanagement occurs.
Proxy authorization tokens, NTLM challenge-response states, or Kerberos ticket caches can suffer from cross-contamination.
As a result, credentials or authentication headers intended for one specific session or user context leak into requests dispatched for another.
An attacker or malicious cross-origin entity can exploit this state leakage to hijack existing connections or spoof authentications.
This enables unauthorized access to backend resources or proxy channels protected under different user credentials.
Compounding this issue, the entire 2.x branch of AsyncHttpClient has officially reached its end of life (EOL).
Because the maintainers have designated the 2.x line as dead, no backported security patches will ever be released for these versions.
Version 2.16.1 remains permanently vulnerable to CVE-2026-107230 and four companion flaws without any possibility of a local fix.
Automated dependency scanners like Dependabot and OSV have historically failed to capture these advisory states accurately.
Older scans frequently report legacy 2.x versions or early 3.x builds as secure due to delayed database synchronization.
Consequently, developers relying solely on standard dependency alerts remain dangerously unaware of active exploitation vectors.
Mitigating this vulnerability requires a complete architectural migration away from the unsupported 2.x ecosystem entirely.
Teams must refactor their dependencies to adopt version 3.0.14 or later of AsyncHttpClient where these connection management flaws are resolved.
Failure to upgrade leaves enterprise applications exposed to cross-session credential leakage and unauthorized resource access over proxies.
DailyCVE Form:
Platform: AsyncHttpClient Java
Version: Less than 2.16.1
Vulnerability : Authentication credential leak
Severity: High
date: October 12, 2026
Prediction: Never patched officially
What Undercode Say:
Bash Commands And Code Usage:
java -jar async-http-client-check.jar target/ java -jar async-http-client-check.jar myapp.jar java -jar async-http-client-check.jar --version-of 2.16.1
Exploit: (Educational Purposes!)
The exploitation vector relies on establishing a shared AsyncClient instance configured with NTLM or proxy credentials. By concurrently firing requests across disparate security contexts, the client inadvertently attaches stale authorization tokens to secondary streams. Attackers monitor or trigger proxy handshakes to capture or hijack cross-contaminated session tokens.
Protection: from this CVE
Upgrade immediately from the legacy 2.x line to version 3.0.14. Since 2.x is end of life and will not receive fixes, migration is the only viable remediation.
Impact:
Credential exposure, cross-session request spoofing, unauthorized proxy utilization, and severe risk of session hijacking across multi-tenant applications.
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Sources:
Reported By: github.com
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