CVE-2026-118371 LibreSSL through 4.4.0 CRLF Injection via OCSP_sendreq_new() Request Line

Medium 6.3 Published 28 Oct 2026 Updated 28 Oct 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-118371?

CVE-2026-118371 is a medium-severity vulnerability in OpenBSD LibreSSL, published on 28 Oct 2026.

Official description

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.

Weakness: CWE-93

Which versions are affected by CVE-2026-118371?

How do I fix CVE-2026-118371?

No fix has been published for CVE-2026-118371 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-118371 being exploited?

There is no known exploitation of CVE-2026-118371 in the wild and no public exploit code.

Sources

Also known as GHSA-p83x-c6v7-9mxw.