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.

Related CPE's

Could not find any relations

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.sbin/ocspcheck/http.c#L299

https://github.com/openbsd/src/commit/0f7039667044d1cd252cc72134e499186da4da25

https://www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-cleartext-transmission-of-ocsp-requests-via-url2host

Weaknesses

[email protected]

Primary
CWE-319

CVSS impact metrics

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

3.7 · Low

Information

Source identifier

[email protected]

Vulnerability status

Deferred

Published

2026-10-28T03:17:13.770Z

13 hours ago

Last modified

2026-10-28T14:49:05.060Z

1 hour ago