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JLSEC-2026-1221 High 7.5

A vulnerability in libcurl caused the HTTP `Referer:` header to persist even when explicitly...

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JLSEC Published
Modified
Severity
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected Packages
CURL_jll >= 8.20.0+0, < 8.21.0+0
LibCURL_jll >= 8.18.0+0, < 8.21.0+0
Upstream
CVE-2026-9546 GHSA-25rx-86v8-32c6 EUVD-2026-41494

A vulnerability in libcurl caused the HTTP Referer: header to persist even when explicitly cleared. While the documentation states that passing NULL to CURLOPT_REFERER suppresses the header, the option failed to clear the internal state. As a result the previous referrer string was erroneously reused and sent in subsequent requests, potentially leaking sensitive information to unintended servers.

References