Bug 2461204 (CVE-2026-5545) - CVE-2026-5545 curl: libcurl: Authentication bypass due to incorrect HTTP Negotiate connection reuse
Summary: CVE-2026-5545 curl: libcurl: Authentication bypass due to incorrect HTTP Nego...
Keywords:
Status: NEW
Alias: CVE-2026-5545
Deadline: 2026-04-29
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-23 16:48 UTC by OSIDB Bzimport
Modified: 2026-10-14 13:57 UTC (History)
40 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:56869 0 None None None 2026-10-14 13:57:48 UTC
Red Hat Product Errata RHSA-2026:80512 0 None None None 2026-10-12 02:53:06 UTC

Description OSIDB Bzimport 2026-04-23 16:48:54 UTC 
A flaw was found in libcurl. An application using libcurl that performs an authenticated HTTP(S) request after a Negotiate-authenticated one to the same host may incorrectly reuse the previous connection. This authentication bypass vulnerability allows the second request to be sent over a connection authenticated with different credentials, potentially leading to unauthorized access or information disclosure.
Comment 6 Jon Orris 2026-10-12 02:53:03 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:80512 https://access.redhat.com/errata/RHSA-2026:80512
Comment 7 Jon Orris 2026-10-14 13:57:45 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
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