CVE-2026-42926
NGINX ngx_http_proxy_v2_module vulnerability
- State
- Published
- Severity
- 6.3 Medium
- Published
- May 13, 2026
- Updated
- May 13, 2026
- Reserved
- May 5, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | 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 | f5 |
| 3.1 | 5.8 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N | f5 |
Weaknesses
- CWE-172 Encoding Error
Affected Products
| Product | Versions |
|---|---|
NGINX Open SourceF5 |
|
References
- https://my.f5.com/manage/s/article/K000161131vendor-advisorypatch
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