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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-40701

25
FAUCET Score

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.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

First published: May 13, 2026Last modified: May 13, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.3.0, <= 4.7.0CPE matchmatch criteria
cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*
4.8.0CPE matchmatch criteria
cpe:2.3:a:f5:dos:4.8.0:*:*:*:*:nginx:*:*
>= 1.3.0, <= 1.6.2CPE matchmatch criteria
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
>= 2.0.0, <= 2.6.0CPE matchmatch criteria
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
>= 3.5.0, <= 3.7.2CPE matchmatch criteria
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

6.3MEDIUM

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
LOW
VS Integrity
NONE
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.68%
Probability of exploitation in next 30 days
EPSS Percentile
48.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0068 is in the 9th percentile among its peer group of 19,955 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

microsoftpatch availablevia msrc
Product: 21341-17084Fixed in: 1.28.3-2
microsoftpatch availablevia msrc
Product: azl3 nginx 1.28.3-1 on Azure Linux 3.0Fixed in: 1.28.3-2
ubuntupatch availablevia ubuntu_usn
Product: nginx (jammy)Fixed in: 1.18.0-6ubuntu14.12
ubuntupatch availablevia ubuntu_usn
Product: nginx (noble)Fixed in: 1.24.0-2ubuntu7.9
ubuntupatch availablevia ubuntu_usn
Product: nginx (questing)Fixed in: 1.28.0-6ubuntu1.4
ubuntupatch availablevia ubuntu_usn
Product: nginx (resolute)Fixed in: 1.28.3-2ubuntu1.2

Vendor Advisories (2)

ubuntuUSN-8354-1

nginx vulnerabilities

Jun 1, 2026
microsoft2026-May/CVE-2026-40701Moderate

NGINX ngx_http_ssl_module vulnerability

May 12, 2026

References

my.f5.com / manage/s/article/K000161021
MitigationVendor Advisory