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CVE-2026-42926

nvd nist
Published: May 13, 2026Modified: Jun 18, 2026

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6.3
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/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
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CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/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:XShow less
Source: f5sirt@f5.com (Secondary)

Description

When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected (7)

F5
4 products
Nginx Gateway Fabric
Nginx Open Source
Nginx Instance Manager
Nginx Ingress Controller
Configuration A
2 vulnerable
Vulnerable SoftwareAffected Versions
Nginx Gateway Fabric
From 1.3.0 to 1.6.2
Nginx Open Source
From 1.29.4 to 1.30.0
Configuration B
2 vulnerable
Vulnerable SoftwareAffected Versions
Nginx Gateway Fabric
From 2.0.0 to 2.6.0
Nginx Instance Manager
From 2.16.0 to 2.22.0
Configuration C
3 vulnerable
Vulnerable SoftwareAffected Versions
F5
Nginx Ingress Controller
From 3.5.0 to 3.7.2
Nginx Ingress Controller
From 4.0.0 to 4.0.1
Nginx Ingress Controller
From 5.0.0 to 5.4.2

Related CWEs

CWE-172
Encoding Error
The product does not properly encode or decode the data, resulting in unexpected values.

References (1)

Source: f5sirt@f5.com
MitigationVendor Advisory

Timeline

No history available yet.