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  4. CVE 2026 118374 libressl ocspcheck through 440 memory exhaustion
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Back to active CVEs
High · CVSS 8.2CVE-2026-118374

LibreSSL ocspcheck through 4.4.0 Memory Exhaustion via Unbounded OCSP HTTP ResponseCVE-2026-118374

Answer in brief

CVE-2026-118374 records a High severity (CVSS 8.2) vulnerability in LibreSSL ocspcheck through 4.4.0 Memory Exhaustion via Unbounded OCSP HTTP Response. 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

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-770
Source
CVE List V5
Source checked
Oct 28, 2026
References
6 linked sources
Open source record

Key facts

Risk
High · CVSS 8.2
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 8.2. 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
  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

LibreSSL ocspcheck through 4.4.0 contains a memory exhaustion vulnerability that allows malicious OCSP responders to exhaust memory by sending unbounded HTTP responses. Attackers controlling the responder or intercepting plain HTTP AIA OCSP traffic can stream endless headers or body data to http_head_read() and http_body_read(), denying certificate status checks.

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 Cleartext Transmission of OCSP Requests via url2host()Same openbsd/libressl package