Bug 2461203 (CVE-2026-6276) - CVE-2026-6276 curl: libcurl: Information disclosure due to cookie leak when reusing connections with custom Host headers
Summary: CVE-2026-6276 curl: libcurl: Information disclosure due to cookie leak when r...
Keywords:
Status: NEW
Alias: CVE-2026-6276
Deadline: 2026-04-29
Product: Security Response
Classification: Other
Component: vulnerability-draft
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
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Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-23 16:48 UTC by OSIDB Bzimport
Modified: 2026-04-30 09:52 UTC (History)
25 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-04-23 16:48:30 UTC 
A flaw was found in libcurl. This vulnerability allows for information disclosure when a custom `Host:` header is used in an initial HTTP request, and a subsequent request reuses the same connection without specifying a new `Host:` header. In such a scenario, libcurl may incorrectly send cookies intended for the first host to the second host, leading to a cookie leak. This issue is an Origin Validation Error (CWE-346).
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