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  4. CVE 2026 118373 libressl ocspcheck through 440 cleartext
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Back to active CVEs
Medium · CVSS 6.3CVE-2026-118373

LibreSSL ocspcheck through 4.4.0 Cleartext Transmission of OCSP Requests via url2host()CVE-2026-118373

Answer in brief

CVE-2026-118373 records a Medium severity (CVSS 6.3) vulnerability in LibreSSL ocspcheck through 4.4.0 Cleartext Transmission of OCSP Requests via url2host(). The current sources do not mark it as known exploited. The current feed maps OpenBSD/LibreSSL (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 28, 2026Updated Oct 28, 2026Source checked Oct 28, 2026First seen by HOL Oct 28, 2026Material review Oct 28, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 6.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Not reported

Why this deserves its current priority

CVSS is 6.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps OpenBSD/LibreSSL (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
OpenBSD/LibreSSLgeneric>=0 <=4.4.0Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for OpenBSD/LibreSSL.
  2. 2Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

  1. Published upstream

    Oct 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 28, 2026

Sources and claim methodology

  • Source referenceftp.openbsd.org
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • LibreSSL through 4.4.0 CRLF Injection via OCSP_sendreq_new() Request LineSame openbsd/libressl package
  • LibreSSL ocspcheck through 4.4.0 CRLF Injection via AIA OCSP URL PathSame openbsd/libressl package
  • LibreSSL ocspcheck through 4.4.0 Memory Exhaustion via Unbounded OCSP HTTP ResponseSame openbsd/libressl package

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-319
Source
CVE List V5
Source checked
Oct 28, 2026
References
5 linked sources
Open source record