Bug 2537784

Summary: CVE-2026-80255 curl: curl: Information disclosure due to secure cookie attribute bypass [fedora-all]
Product: [Fedora] Fedora Reporter: Srikanth Balasubramanian <sbalasub>
Component: curlAssignee: Jan Macku <jamacku>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: low Docs Contact:
Priority: low    
Version: rawhideCC: jamacku, jmigacz, kdudka, lzaoral, msekleta, paul, vmihalko
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["113f4d2b-f36d-4615-900b-fbe30f5a865f"]}
Fixed In Version: curl-8.18.0-12.fc44 curl-8.15.0-12.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-10-08 01:16:39 UTC 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:    
Bug Blocks: 2529205    

Description Srikanth Balasubramanian 2026-09-22 09:13:39 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.

A `Set-Cookie:` header using tab (horizontal tab, ASCII code 9) instead of
space (ascii code 32) immediately before the `Secure` attribute causes curl to
store the cookie without its Secure flag. The cookie might then wrongfully be
sent over plaintext HTTP on subsequent requests to the same host.

Comment 1 Fedora Update System 2026-10-06 08:56:17 UTC
FEDORA-2026-c2d4a9aa16 (curl-8.21.0-7.fc45) has been submitted as an update to Fedora 45.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-c2d4a9aa16

Comment 2 Fedora Update System 2026-10-06 13:53:33 UTC
FEDORA-2026-8efcd7a2a0 (curl-8.18.0-12.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-8efcd7a2a0

Comment 3 Fedora Update System 2026-10-07 01:59:29 UTC
FEDORA-2026-c2d4a9aa16 has been pushed to the Fedora 45 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-c2d4a9aa16`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-c2d4a9aa16

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

Comment 4 Fedora Update System 2026-10-07 02:27:58 UTC
FEDORA-2026-8efcd7a2a0 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-2026-8efcd7a2a0`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-8efcd7a2a0

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

Comment 5 Fedora Update System 2026-10-07 12:02:53 UTC
FEDORA-2026-3ea898ea77 (curl-8.15.0-11.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-3ea898ea77

Comment 6 Fedora Update System 2026-10-08 01:16:39 UTC
FEDORA-2026-8efcd7a2a0 (curl-8.18.0-12.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 7 Fedora Update System 2026-10-08 03:01:22 UTC
FEDORA-2026-3ea898ea77 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-2026-3ea898ea77`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-3ea898ea77

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

Comment 8 Fedora Update System 2026-10-16 21:14:38 UTC
FEDORA-2026-d65da12723 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-d65da12723`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-d65da12723

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

Comment 9 Fedora Update System 2026-10-20 05:06:42 UTC
FEDORA-2026-d65da12723 (curl-8.15.0-12.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.