CVE WatchOct 28, 2026

CVE-2026-118373

LibreSSL ocspcheck through 4.4.0 contains a cleartext transmission vulnerability because url2host() discards the OCSP URL scheme and http_al

CVSS

3.7

Low

EPSS

0.1%

KEV

—

Exploit Today

0-100

Published: Oct 28, 2026 · Last modified: Oct 28, 2026 · CWE-319

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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