nginx: When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_...
CVE-2026-42926 is fixed in 18 products on 1 platform, first by ALAS2023-2026-1714, released May 25, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| nginx · Debian 14 | 1.30.0-4 | DEBIAN-CVE-2026-42926 | May 27, 2026 |
| nginx · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-all-modules · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-core · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-core-debuginfo · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-debuginfo · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-debugsource · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-filesystem · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-mod-devel · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-mod-http-image-filter · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-mod-http-image-filter-debuginfo · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-mod-http-perl · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-mod-http-perl-debuginfo · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-mod-http-xslt-filter · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-mod-http-xslt-filter-debuginfo · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-mod-mail · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-mod-mail-debuginfo · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-mod-stream · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
| nginx-mod-stream-debuginfo · amzn 2023 | 1:1.30.1-1.amzn2023.0.1 | ALAS2023-2026-1714 | May 25, 2026 |
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