OpenBSD LibreSSL up to 4.4.0 ocspcheck http_head_read/http_body_read memory allocation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.5$0-$5k1.31

Summaryinfo

A vulnerability marked as problematic has been reported in OpenBSD LibreSSL up to 4.4.0. Affected by this vulnerability is the function http_head_read/http_body_read of the component ocspcheck. This manipulation causes memory allocation. The identification of this vulnerability is CVE-2026-118374. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in OpenBSD LibreSSL up to 4.4.0. It has been declared as problematic. Affected by this vulnerability is the function http_head_read/http_body_read of the component ocspcheck. The manipulation with an unknown input leads to a memory allocation vulnerability. The CWE definition for the vulnerability is CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. As an impact it is known to affect availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-118374 since 10/28/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available.

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

Type

Vendor

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Version

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Website

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: 5.6
VulDB Meta Temp Score: 5.5

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

CNA Base Score: 5.9
CNA Vector (VulnCheck): 🔒

CVSSv2info

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

Exploitinginfo

Class: Memory allocation
CWE: CWE-789 / CWE-400 / CWE-404
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-2026-118374 (🔒)
GCVE (CVE): GCVE-0-2026-118374
GCVE (VulDB): GCVE-100-427669

Entryinfo

Created: 10/28/2026 03:46
Changes: 10/28/2026 03:46 (76)
Complete: 🔍
Cache ID: 216::103

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