Bug 2509282 - CVE-2026-8927 curl: Information disclosure due to uncleared proxy authentication state [fedora-all]
Summary: CVE-2026-8927 curl: Information disclosure due to uncleared proxy authenticat...
Keywords:
Status: ON_QA
Alias: None
Product: Fedora
Classification: Fedora
Component: curl
Version: 45
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
Assignee: Jan Macku
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: {"flaws": ["8769b971-d276-4ed3-a339-1...
Depends On:
Blocks: CVE-2026-8927
TreeView+ depends on / blocked
 
Reported: 2026-07-30 13:20 UTC by Lukas Javorsky
Modified: 2026-08-28 01:37 UTC (History)
7 users (show)

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


Attachments (Terms of Use)

Description Lukas Javorsky 2026-07-30 13:20:00 UTC
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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 1 Aoife Moloney 2026-08-17 15:41:23 UTC
This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.

Comment 2 Fedora Update System 2026-08-25 08:52:43 UTC
FEDORA-2026-2f88b83676 (curl-8.18.0-9.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-2f88b83676

Comment 3 Fedora Update System 2026-08-26 02:01:52 UTC
FEDORA-2026-2f88b83676 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-2f88b83676`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-2f88b83676

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-08-27 00:55:28 UTC
FEDORA-2026-2f88b83676 (curl-8.18.0-9.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 5 Fedora Update System 2026-08-27 16:18:44 UTC
FEDORA-2026-f903f9ff11 (curl-8.15.0-9.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-f903f9ff11

Comment 6 Fedora Update System 2026-08-28 01:37:12 UTC
FEDORA-2026-f903f9ff11 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-f903f9ff11`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-f903f9ff11

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.


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