CVE-2026-118371
LowCVSS 3.7Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
LibreSSL through 4.4.0 contains a CRLF injection vulnerability in the libcrypto OCSP_sendreq_new() and OCSP_parse_url() functions, which write unvalidated request paths into the OCSP POST request line. Attackers can embed carriage return and line feed characters in a certificate's Authority Information Access OCSP URI to inject HTTP headers or split requests sent to responders and proxies.
Risk Assessment
Header injection or splitting of OCSP requests may enable manipulation of communication with responders and proxies and potential forgery of validation responses. This poses a risk to the integrity and trust of the OCSP process.
Recommendation
Update LibreSSL to a non-vulnerable version that validates URI paths for control characters. Use properly validated certificate data in OCSP requests.
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Original NVD description (English source)
LibreSSL through 4.4.0 contains a CRLF injection vulnerability in the libcrypto OCSP_sendreq_new() and OCSP_parse_url() functions, which write unvalidated request paths into the OCSP POST request line. Attackers can embed carriage return and line feed characters in a certificate's Authority Information Access OCSP URI to inject HTTP headers or split requests sent to responders and proxies.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

