Bug 2529205 (CVE-2026-80255)

Summary: CVE-2026-80255 curl: curl: Information disclosure due to secure cookie attribute bypass
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: akhatavk, anthomas, aos-team-art-private, asdas, bbrownin, crizzo, csutherl, dpaolell, ehelms, ggainey, gtanzill, jbuscemi, jclere, jdelft, jpasqual, jupierce, juwatts, lgarciaa, mbiarnes, mdellweg, mhulan, nmoumoul, osousa, pcreech, pjindal, plodge, ppalepu, ppostler, prdhamdh, rchan, rekumar, rhel-process-autobot, sdawley, sghai, sidsharm, smallamp, suppawar, szappis, tmalecek, vchlup, vlaad, vvoronko, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in curl. When a `Set-Cookie:` header uses a tab character instead of a space before the `Secure` attribute, curl incorrectly stores the cookie without the Secure flag. This can lead to information disclosure, as the cookie may then be sent over unencrypted HTTP connections to the same host, potentially exposing sensitive data.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2537783, 2537784    
Bug Blocks:    

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.