Vulnerability Description
LibreSSL ocspcheck through 4.4.0 contains a cleartext transmission vulnerability because url2host() discards the OCSP URL scheme and http_alloc() only selects TLS for port 443. On-path network attackers can read OCSP requests sent to https responder URLs on non-443 ports, exposing certificate serial numbers, issuer hashes, and nonces.
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/commit/0f7039667044d1cd252cc72134e499186da4da25
- https://www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-cleartext-
FAQ
What is CVE-2026-118373?
CVE-2026-118373 is a vulnerability with a CVSS score of 3.7 (LOW). LibreSSL ocspcheck through 4.4.0 contains a cleartext transmission vulnerability because url2host() discards the OCSP URL scheme and http_alloc() only selects TLS for port 443. On-path network attacke...
How severe is CVE-2026-118373?
CVE-2026-118373 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-2026-118373?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.