OpenBSD LibreSSL up to 4.4.0 OCSP_sendreq_new/OCSP_parse_url crlf injection

CVSS Meta Temp Score
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CTI Interest Score
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4.4$0-$5k0.97+

Summaryinfo

A vulnerability was found in OpenBSD LibreSSL up to 4.4.0. It has been declared as problematic. This impacts the function OCSP_sendreq_new/OCSP_parse_url. Executing a manipulation can lead to crlf injection. This vulnerability appears as CVE-2026-118371. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in OpenBSD LibreSSL up to 4.4.0. It has been declared as problematic. This vulnerability affects the function OCSP_sendreq_new/OCSP_parse_url. The manipulation with an unknown input leads to a crlf injection vulnerability. The CWE definition for the vulnerability is CWE-93. The product uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-118371 since 10/28/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/28/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 4.5
VulDB Meta Temp Score: 4.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.7
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Crlf injection
CWE: CWE-93 / CWE-74 / CWE-707
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

10/28/2026 Advisory disclosed
10/28/2026 +0 days CVE reserved
10/28/2026 +0 days VulDB entry created
10/28/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: openbsd.org

Advisory: github.com
Status: Not defined

CVE: CVE-2026-118371 (🔒)
GCVE (CVE): GCVE-0-2026-118371
GCVE (VulDB): GCVE-100-427678

Entryinfo

Created: 10/28/2026 03:48
Changes: 10/28/2026 03:48 (75)
Complete: 🔍
Cache ID: 216::103

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