CVE-2026-42926When 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…
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It affects f5 nginx_gateway_fabric and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.8 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
- Weakness (CWE)
- CWE-172
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 18, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
f5 nginx_gateway_fabric f5:nginx_gateway_fabric | from 1.3.0 through 1.6.2; from 2.0.0 through 2.6.0 | NVD |
f5 nginx_open_source f5:nginx_open_source | from 1.29.4 through 1.30.0 | NVD |
f5 nginx_instance_manager f5:nginx_instance_manager | from 2.16.0 through 2.22.0 | NVD |
f5 nginx_ingress_controller f5:nginx_ingress_controller | from 3.5.0 through 3.7.2; from 4.0.0 through 4.0.1; from 5.0.0 through 5.4.2 | NVD |
References
- https://my.f5.com/manage/s/article/K000161131mitigation, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.