CVE-2026-118373
lowLibreSSL ocspcheck through 4.4.0 contains a cleartext transmission vulnerability because url2host() discards the OCSP URL scheme and http_alloc() only selects…
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
3.7
3.7 (CVSS v3.1)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Severity source: NVD CVSS v3.1 (disclosure@vulncheck.com)
Timeline (UTC)
Published: 2026-10-28 03:17
Modified: 2026-10-28 14:49
NVD status: Deferred
Last synced 1 day ago
Verified against the source API 2026-10-28 14:55 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt disclosure@vulncheck.com
- https://github.com/libressl/portable disclosure@vulncheck.com
- https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr.sbin/ocsp... disclosure@vulncheck.com
- https://github.com/openbsd/src/commit/0f7039667044d1cd252cc72134e499186da4da25 disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-cleartext-transmissi... disclosure@vulncheck.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-28 14:55 UTC · record ↗