Bug 2529205 (CVE-2026-80255) - CVE-2026-80255 curl: curl: Information disclosure due to secure cookie attribute bypass
Summary: CVE-2026-80255 curl: curl: Information disclosure due to secure cookie attrib...
Keywords:
Status: NEW
Alias: CVE-2026-80255
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2537783 2537784
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-06 18:01 UTC by OSIDB Bzimport
Modified: 2026-09-22 09:17 UTC (History)
44 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
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Description OSIDB Bzimport 2026-09-06 18:01:42 UTC 
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.
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