CVE-2026-42926
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 6.3
- CVSS 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 probability
- 0.35%
- CWE
- CWE-172
- Published
- 2026-05-13
- Last modified
- 2026-05-13
Affected products
- F5 NGINX Open Source
- F5 NGINX Open Source
Weakness type
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