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.
Published: 2026-10-28
Score: 6.3 Medium
EPSS: n/a
KEV: No
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History

Wed, 28 Oct 2026 02:30:00 +0000

Type Values Removed Values Added
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.
Title LibreSSL ocspcheck through 4.4.0 Cleartext Transmission of OCSP Requests via url2host()
First Time appeared Openbsd
Openbsd libressl
Weaknesses CWE-319
CPEs cpe:2.3:a:openbsd:libressl:*:*:*:*:*:*:*:*
Vendors & Products Openbsd
Openbsd libressl
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

Openbsd Libressl
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-28T02:03:21.525Z

Reserved: 2026-10-28T01:19:20.564Z

Link: CVE-2026-118373

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-28T03:17:13.770

Modified: 2026-10-28T03:17:13.770

Link: CVE-2026-118373

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-28T03:30:15Z

Weaknesses