CVE-2026-42926 MEDIUM

CVE-2026-42926: NGINX ngx_http_proxy_v2_module vulnerability

Vendor F5

Product NGINX Open Source

Weakness CWE-172

Published May 13, 2026

Last update May 13, 2026

View on NVD All CVEs

CVSS base score

5.8/10

Attack vector Network

Attack complexity Low

Privileges required None

User interaction None

Confidentiality None

Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

What the vulnerability does

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.

Key dates

Disclosure timeline

May 13, 2026 CVE published

May 13, 2026 Record updated