Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2026-40701

Severity CVSS v4.0:
MEDIUM
Type:
CWE-416 Use After Free
Publication date:
13/05/2026
Last modified:
23/06/2026

Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssl_module module when the ssl_verify_client directive is set to "on" or "optional," and the ssl_ocsp directive is set to "on" or the leaf parameters are configured with a resolver. With this configuration, an unauthenticated attacker can send requests along with conditions beyond its control that may cause a heap-use-after-free error in the NGINX worker process. This vulnerability may result in limited modification of data or the NGINX worker process restarting.<br /> <br /> <br /> <br />  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Impact

Vector 4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N CVSS v4.0 Severity and Metrics:

Base Score: 6.30 MEDIUM
Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

Attack Vector (AV): Network
Attack Complexity (AC): Low
Attack Requirements (AT): Present
Privileges Required (PR): None
User Interaction (UI): None
Confidentiality (VC): Low
Integrity (VI): None
Availability (VA): Low
Confidentiality (SC): None
Integrity (SI): None
Availability (SA): None

Base Score 4.0
6.30
Severity 4.0
MEDIUM
Vector 3.x
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L CVSS v3.1 Severity and Metrics:

Base Score: 4.80 MEDIUM
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): Low
Integrity (I): None
Availability (A): Low

Base Score 3.x
4.80
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:* 4.3.0 (including) 4.7.0 (including)
cpe:2.3:a:f5:dos:4.8.0:*:*:*:*:nginx:*:*
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* 1.3.0 (including) 1.6.2 (including)
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:* 2.0.0 (including) 2.6.0 (including)
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* 3.5.0 (including) 3.7.2 (including)
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* 4.0.0 (including) 4.0.1 (including)
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:* 5.0.0 (including) 5.4.2 (including)
cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:* 2.16.0 (including) 2.22.0 (including)
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:* 1.19.0 (including) 1.30.0 (including)
cpe:2.3:a:f5:nginx_plus:*:*:*:*:*:*:*:* r32 (including) r36 (including)
cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* 4.9.0 (including) 4.16.0 (including)
cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* 5.1.0 (including) 5.8.0 (including)
cpe:2.3:a:f5:waf:*:*:*:*:*:nginx:*:* 5.9.0 (including) 5.12.1 (including)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools