Description
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.
Published: 2026-10-28
Score: 6.3 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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History

Wed, 28 Oct 2026 02:30:00 +0000

Type Values Removed Values Added
Description 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.
Title LibreSSL through 4.4.0 CRLF Injection via OCSP_sendreq_new() Request Line
First Time appeared Openbsd
Openbsd libressl
Weaknesses CWE-93
CPEs cpe:2.3:a:openbsd:libressl:*:*:*:*:*:*:*:*
Vendors & Products Openbsd
Openbsd libressl
References
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}

Subscriptions

Openbsd Libressl
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-28T02:03:20.152Z

Reserved: 2026-10-28T01:19:19.814Z

Link: CVE-2026-118371

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-28T03:17:13.443

Modified: 2026-10-28T03:17:13.443

Link: CVE-2026-118371

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-28T03:30:15Z

Weaknesses
  • CWE-93

    Improper Neutralization of CRLF Sequences ('CRLF Injection')