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CVE-2026-58055 is an HTTP request/response smuggling vulnerability in nghttp2's nghttpx proxy through version 1.69.0. The proxy forwards HTTP/1.1 Upgrade requests containing a Content-Length header and a body onto reusable keep-alive backend connections. It re-adds the Upgrade and Connection headers while passing Content-Length verbatim, producing an ambiguous message. If the backend interprets that ambiguity in the attacker's favor, exploitation can cause HTTP request/response smuggling and cross-client response-queue poisoning.
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No public exploit code observed for this vulnerability.
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35 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in nghttp2's nghttpx proxy through version 1.69.0 allows ambiguous HTTP/1.1 Upgrade requests to reach reusable backend connections, potentially enabling request/response smuggling and cross-client response-queue poisoning. The advisory identifies affected nghttp2 packages on EulerOS 2.0 SP15 and recommends updating them. The listed CVSS v3 base score is 5.4 and CVSS v4 base score is 6.3. Nessus detects affected versions using self-reported version information rather than testing exploitation.
A vulnerability affecting the libnghttp2 package in Huawei EulerOS 2.0. The supplied CVSS vectors describe network exploitation with high attack complexity, no required privileges or user interaction, and limited confidentiality and integrity impacts. Exploits and a patch are reported available. The technical root cause is not provided.
A moderate-severity network-reachable vulnerability with high attack complexity, no privileges or user interaction required, and limited confidentiality and integrity impact. The supplied record indicates publicly available exploits and a published patch, but does not identify the affected component or product.
A moderate-severity vulnerability tracked as CVE-2026-58055 affecting an AlmaLinux-related package or component; the provided record does not identify the specific affected product/package or technical flaw type.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.