AIKIDO-2026-896244
libcurl is vulnerable to Information Disclosure
37
Low Risk
This Affects:
libcurlTL;DR
Setting CURLOPT_REFERER to NULL is documented to suppress the Referer header, but the previous value stays in the handle. Later requests on that handle still send the old Referer value, which discloses the prior URL to a server that should not receive it. The fix clears the stored referrer when the option is set to NULL.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you clear CURLOPT_REFERER on a reused easy handle.
Background info
libcurl is vulnerable to Information Disclosure in versions 8.18.0 - 8.20.0.
How to fix this
Upgrade the libcurl and/or the curl.curl library to the patch version.
Links
GitHub Release
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