Vulnerability 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.
CVSS Score
LOW
Related Weaknesses (CWE)
References
- https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt
- https://github.com/libressl/portable
- https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr
- https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr
- https://github.com/openbsd/src/commit/3adb7688a5bcfb675fa6d8b10e242022d620a23d
- https://github.com/openbsd/src/commit/6efdc4cce3fac9fa7208a9452f84de34c5a68e9f
- https://www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-crlf-injec
FAQ
What is CVE-2026-118372?
CVE-2026-118372 is a vulnerability with a CVSS score of 3.7 (LOW). 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 url2hos...
How severe is CVE-2026-118372?
CVE-2026-118372 has been rated LOW with a CVSS base score of 3.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-118372?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.