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CVE-2026-9546

high CVSS 7.5 EPSS 0.7%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-9546 applies to, and the release that fixes it where the sources name one.

curl 8.1.2 fixed in 8.20.1

At a glance

Severity
High
CVSS base score
7.5 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.7% probability of exploitation in the next 30 days, higher than 50% of scored vulnerabilities
Weakness
CWE-200
Published
2026-07-03
NVD CVE.org

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