🛡️ CVE-2026-42926 — nginx

🟡 CVSS 5.8 — Medium ✅ No Known Exploit NVD
5.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

NGINX ngx_http_proxy_v2_module vulnerability

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality none, integrity low, availability none.

Affected software

CVE-2026-42926 is recorded against 7 packages.

  • nginx
  • nginx-gateway
  • nginx-gateway-fabric (from 2.0.0 up to 2.6.0)
  • nginx-ingress-controller (from 5.0.0 up to 5.4.2)
  • nginx-instance-manager (from 2.16.0 up to 2.22.0)
  • nginx-open-source (from 1.29.4 up to 1.30.0)
  • unknown

Timeline and source

Published on 15 May 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

my.f5.com (Web)
nvd.nist.gov (Web)

CVE-2026-42926 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 5.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-05-15
Updated 2026-08-12
Modified 2026-05-15
Fix URL N/A

Affected Packages

Software From version Fixed in
nginx — —
nginx-gateway — —
nginx-gateway-fabric 2.0.0 2.6.0
nginx-ingress-controller 5.0.0 5.4.2
nginx-instance-manager 2.16.0 2.22.0
nginx-open-source 1.29.4 1.30.0
unknown — —

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