Bug 2547725 (CVE-2026-107281)

Summary:	CVE-2026-107281 org.asynchttpclient/async-http-client: AsyncHttpClient: Privilege escalation via connection pool reuse
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	gmalinko, janstey, pdelbell, rstepani
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in AsyncHttpClient. When connection-oriented authentication mechanisms, such as NT LAN Manager (NTLM) or Negotiate, are used, the HTTP connection pool does not account for the authenticated user identity. Consequently, a connection authenticated by one user can be reused by requests from a different user, causing the remote server to process the subsequent request under the original user's identity. This flaw allows an attacker to gain unauthorized access and achieve privilege escalation by executing actions as another user.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2026-10-07 21:31:47 UTC

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, the HTTP/1.1 connection-pool key excludes the authenticated principal for connection-oriented NTLM and Negotiate authentication. A pooled socket authenticated for one request can be reused by a request carrying another principal, and the server executes that later request as the first identity. Basic and Digest are not affected because they authenticate each request. This issue is fixed in versions 3.0.13 and 2.16.1.