---
id: CVE-2026-118373
title: >-
  LibreSSL ocspcheck through 4.4.0 Cleartext Transmission of OCSP Requests via
  url2host()
summary: >-
  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 htt…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-319
vendor: OpenBSD
product: LibreSSL
affected:
  - LibreSSL <= 4.4.0
published: '2026-10-28'
updated: '2026-10-28'
sourceUpdated: '2026-10-28T02:03:21.525Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-118373'
references:
  - url: >-
      https://github.com/openbsd/src/commit/0f7039667044d1cd252cc72134e499186da4da25
  - url: >-
      https://github.com/openbsd/src/blob/17a8e44328ee2505d69723a126a390a526e50370/usr.sbin/ocspcheck/http.c#L299
  - url: 'https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-4.4.0-relnotes.txt'
    label: LibreSSL 4.4.0 Release Notes
  - url: 'https://github.com/libressl/portable'
  - url: >-
      https://www.vulncheck.com/advisories/libressl-ocspcheck-through-4.4.0-cleartext-transmission-of-ocsp-requests-via-url2host
    label: >-
      VulnCheck Advisory: LibreSSL ocspcheck through 4.4.0 Cleartext
      Transmission of OCSP Requests via url2host()
tags:
  - cve.org
ingestedAt: '2026-10-28T03:02:57.623Z'
---

## Overview

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.

## Affected

- `LibreSSL <= 4.4.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.