CVE-2026-118372 LibreSSL ocspcheck through 4.4.0 CRLF Injection via AIA OCSP URL Path

Medium 6.3 Published 28 Oct 2026 Updated 28 Oct 2026

Exploited in the wild: Not known
Fix: None listed

What is CVE-2026-118372?

CVE-2026-118372 is a medium-severity vulnerability in OpenBSD LibreSSL, published on 28 Oct 2026.

Official description

LibreSSL ocspcheck through 4.4.0 contains a CRLF injection vulnerability that allows attackers to inject HTTP headers by embedding CR/LF sequences in a certificate's AIA OCSP URI path. Because url2host() copies the path without rejecting control characters and http_open() places it in the POST request line, attackers can inject headers or split OCSP requests sent to the responder host.

Weakness: CWE-93

Which versions are affected by CVE-2026-118372?

How do I fix CVE-2026-118372?

No fix has been published for CVE-2026-118372 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-118372 being exploited?

There is no known exploitation of CVE-2026-118372 in the wild and no public exploit code.

Sources

Also known as GHSA-5qhg-9pm8-2mwp.