CVE-2026-42926
Medium
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.
SeverityMedium
CVSS5.8
Exploit probability—
Product
F5 Nginx Gateway Fabric
PublishedMay 13, 2026
First seenMay 13, 2026
Weakness typeCWE-172CWE-172
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| f5 nginx_gateway_fabric | 1.3.0 ≤ v ≤ 1.6.2, 2.0.0 ≤ v ≤ 2.6.0 | — |
| f5 nginx_open_source | 1.29.4 ≤ v ≤ 1.30.0 | — |
| f5 nginx_instance_manager | 2.16.0 ≤ v ≤ 2.22.0 | — |
| f5 nginx_ingress_controller | 3.5.0 ≤ v ≤ 3.7.2, 4.0.0 ≤ v ≤ 4.0.1, 5.0.0 ≤ v ≤ 5.4.2 | — |
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