---
id: CVE-2026-118371
title: LibreSSL through 4.4.0 CRLF Injection via OCSP_sendreq_new() Request Line
summary: >-
  LibreSSL through 4.4.0 contains a CRLF injection vulnerability in the
  libcrypto OCSP_sendreq_new() and OCSP_parse_url() functions, which write
  unvalidated request paths into the OCSP POST request line. Attackers can embed
  carriage return…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-93
vendor: OpenBSD
product: LibreSSL
affected:
  - LibreSSL <= 4.4.0
published: '2026-10-28'
updated: '2026-10-28'
sourceUpdated: '2026-10-28T02:03:20.152Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-118371'
references:
  - url: >-
      https://github.com/openbsd/src/commit/d3f7195f4849d8a699cea4a3a67677f4b3dc1591
  - url: >-
      https://github.com/openbsd/src/blob/3903c41d301d66facec69f7bf776b182cbc5ed62/lib/libcrypto/ocsp/ocsp_ht.c#L184
  - 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-through-4.4.0-crlf-injection-via-ocsp-sendreq-new-request-line
    label: >-
      VulnCheck Advisory: LibreSSL through 4.4.0 CRLF Injection via
      OCSP_sendreq_new() Request Line
tags:
  - cve.org
ingestedAt: '2026-10-28T03:02:57.626Z'
---

## Overview

LibreSSL through 4.4.0 contains a CRLF injection vulnerability in the libcrypto OCSP_sendreq_new() and OCSP_parse_url() functions, which write unvalidated request paths into the OCSP POST request line. Attackers can embed carriage return and line feed characters in a certificate's Authority Information Access OCSP URI to inject HTTP headers or split requests sent to responders and proxies.

## Affected

- `LibreSSL <= 4.4.0`

## Remediation

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