CVE-2026-42926CWE-172

NGINX ngx_http_proxy_v2_module vulnerability

Medium · published May 13, 2026

CVSS v4.0
6.3
EPSS
0%
Percentile
27.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
6.3 · MEDIUM
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
EPSS
0.00346 · 27.5th percentile
Weakness
CWE-172 · Encoding Error
Published
2026-05-13T14:12Z
EPSS history
Timeline
  • 13 MAY 14:12Z
    NGINX ngx_http_proxy_v2_module vulnerability
    cvelistv5