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CVE-2026-40701

NGINX ngx_http_ssl_module vulnerability

Published: May 13, 2026Updated: Jun 23, 2026 Sources: CVE List NVD BDUCWE-416
4.8MEDIUM
NVD MITRE
EPSS Score
0.7%
Top 52.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:LI:NA:L
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:LAvailability
Low
Open in CVSS calculator →

Weaknesses

CWE-416

Affected Products

dosf5
On-premNetwork Device
Networking Infrastructure / network-management
nginx gateway fabricf5
On-premNetwork Device
Networking Infrastructure / load-balancer-proxy
nginx ingress controllerf5
On-premNetwork Device
Networking Infrastructure / load-balancer-proxy
nginx instance managerf5
On-prem
Networking Infrastructure / load-balancer-proxy
nginx open sourcef5
On-premWeb App
Networking Infrastructure / load-balancer-proxy
f5commercialUSNetworking Infrastructure
and 18 more affected products View all →

Exploitability

Official Patch Available
Workaround Available

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://my.f5.com/manage/s/article/K000161021
my.f5.com
https://my.f5.com/manage/s/article/K000161021
my.f5.com
https://angie.software/angie/docs/pro_changes/
angie.software
and 4 more references View all →

Timeline

Published
May 13, 2026
Last Updated
Jun 23, 2026

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