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nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A backend that resolves the resulting ambiguous message in the attacker's favor enables HTTP request/response smuggling and cross-client response-queue poisoning.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade libnghttp2-develUpgrade libnghttp2Upgrade nghttp2 | Oct 11, 2026 | Aug 13, 2026 |
| Alpine Linux | — | Upgrade nghttp2 | Oct 2, 2026 | Jun 28, 2026 |
| Oracle_linux | — | Upgrade libnghttp2Upgrade nghttp2Upgrade libnghttp2-devel | Oct 22, 2026 | Jun 28, 2026 |
| Redhat_linux | — | Upgrade libnghttp2Upgrade libnghttp2-develNo solution existsUpgrade nghttp2-debugsourceUpgrade nghttp2Upgrade nghttp2-debuginfoUpgrade libnghttp2-debuginfo | Jul 22, 2026 | Jun 28, 2026 |
| Rocky_linux | — | Upgrade libnghttp2-develUpgrade libnghttp2-debuginfoUpgrade libnghttp2Upgrade nghttp2-debuginfoUpgrade nghttp2Upgrade nghttp2-debugsource | Aug 17, 2026 | Aug 14, 2026 |
| Ubuntu | — | Upgrade nghttp2 | Jul 2, 2026 | Jul 2, 2026 |
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