Bug 2496769 (CVE-2026-8927)

Summary: CVE-2026-8927 curl: Information disclosure due to uncleared proxy authentication state
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, bbrownin, csutherl, dbosanac, dpaolell, gtanzill, jbuscemi, jclere, jdelft, jmitchel, jreimann, jupierce, kshier, lgarciaa, mbiarnes, mdessi, mrizzi, pcattana, pjindal, plodge, ppalepu, ppostler, prdhamdh, rekumar, rhel-process-autobot, sdawley, sghai, sidsharm, stcannon, suppawar, szappis, teagle, vchlup, vlaad, vvoronko, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in libcurl. When reusing a libcurl handle for sequential transfers with environment-variable proxy configuration, the library does not properly clear the proxy authentication state. This oversight can lead to the unintended disclosure of `Proxy-Authorization` headers to an incorrect proxy, potentially exposing sensitive authentication information to an unauthorized entity. This is an information disclosure vulnerability.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2509284, 2509288, 2497474, 2509281, 2509282, 2509283, 2509285, 2509286, 2509287, 2509289    
Bug Blocks:    

Description OSIDB Bzimport 2026-07-03 07:02:07 UTC 
When reusing a libcurl handle for sequential transfers driven by
environment-variable proxy configuration, libcurl fails to clear the proxy
authentication state between requests. Specifically, if the initial transfer
authenticates against `proxyA` using Digest auth, a subsequent transfer routed
through `proxyB` erroneously leaks the `Proxy-Authorization:` header intended
solely for `proxyA`.
Comment 4 errata-xmlrpc 2026-08-17 04:31:22 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:55432 https://access.redhat.com/errata/RHSA-2026:55432
Comment 5 errata-xmlrpc 2026-08-19 13:28:38 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Core Services 2.4.62.SP5

Via RHSA-2026:56869 https://access.redhat.com/errata/RHSA-2026:56869