// For flags

CVE-2026-40460

NGINX ngx_quic_module vulnerability

Severity Score

6.9
*CVSS v4

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

When NGINX Plus or NGINX Open Source are configured to use the HTTP/3 QUIC module, an attacker may be able to spoof their source IP address allowing for bypass of authorization or bypass of rate limiting. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

*Credits: F5 acknowledges Rodrigo Laneth of Miralium Research for bringing this issue to our attention and following the highest standards of coordinated disclosure.
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
System
Vulnerable | Subsequent
Confidentiality
Low
None
Integrity
None
None
Availability
Low
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
Low
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2026-04-30 CVE Reserved
  • 2026-05-13 CVE Published
  • 2026-05-13 CVE Updated
  • 2026-05-14 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-290: Authentication Bypass by Spoofing
CAPEC
References (1)
URL Tag Source
URL Date SRC
URL Date SRC
https://my.f5.com/manage/s/article/K000161068 2026-05-13
URL Date SRC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
F5
Search vendor "F5"
 NGINX Open Source
Search vendor "F5" for product "NGINX Open Source"
 >= 1.26.0 < 1.30.1
Search vendor "F5" for product "NGINX Open Source" and version " >= 1.26.0 < 1.30.1"
en
Affected