Bug 2496767 (CVE-2026-11856) - CVE-2026-11856 curl: curl: Information disclosure via incorrect Digest authentication header reuse
Summary: CVE-2026-11856 curl: curl: Information disclosure via incorrect Digest authen...
Keywords:
Status: NEW
Alias: CVE-2026-11856
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: 2026-07-03 07:02 UTC by OSIDB Bzimport
Modified: 2026-09-28 14:23 UTC (History)
23 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-2026:69125 0 None None None 2026-09-21 06:14:42 UTC
Red Hat Product Errata RHSA-2026:72506 0 None None None 2026-09-28 14:23:47 UTC

Description OSIDB Bzimport 2026-07-03 07:02:01 UTC 
Successfully using libcurl to do a transfer to a specific HTTP origin
(`hostA`) with **Digest** authentication and then changing the origin to a
different one (`hostB`) for a second transfer, reusing the same handle, makes
libcurl wrongly pass on the  `Authorization:` header field meant for `hostA`,
to `hostB`.
Comment 2 Jon Orris 2026-09-21 06:14:40 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:69125 https://access.redhat.com/errata/RHSA-2026:69125
Comment 3 Jon Orris 2026-09-28 14:23:46 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:72506 https://access.redhat.com/errata/RHSA-2026:72506
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