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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| F5 | NGINX Open Source | 1.29.4 – < 1.30.1 | 1.30.1 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | nginx | 1.30.0-4 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | nginx +11 | 1.30.2-1.hum1 | RHSA-2026:20351 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | nginx | 1.31.0-1.1 | openSUSE-SU-2026:10796-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | nginx +9 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | nginx-mainline | 1.31.0-r0 | — |
| Wolfi rolling | nginx-stable | 1.30.1-r0 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
-
ikarolaborda/CVE2026-42926 ★ 0 · Jun 6, 2026
Controlled NGINX HTTP/2 frame injection lab for CVE-2026-42926 patch validation and defensive research
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 4
- RHSA-2026:20351 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- WID-SEC-2026-1527 NGINX Open Source and NGINX Plus: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 16, 2026
- ALAS2023-2026-1714 Important: nginx security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Aug 31, 2026
- openSUSE-SU-2026:10796-1 nginx-1.31.0-1.1 on GA media SUSE / openSUSE Security Updates · May 17, 2026
References
- https://my.f5.com/manage/s/article/K000161131 vendor-advisory patch