Vulnerability in Node.js Node
CVE-2026-58044
A flaw in Node.js HTTP client can cause a request desynchronization for Node.js-based forwarding proxies that rebuild outbound headers from the visible `IncomingMessage` headers while piping the original body to a reused backend connection.
Node.js can omit headers beyond `maxHeadersCount` / `maxHeaderPairs` from `req.headers`, `req.rawHeaders`, and `req.headersDistinct`, while still using those omitted headers internally for HTTP message framing. In particular, `Content-Length` can be hidden from userland while the request body is still delivered.
This vulnerability affects all supported release lines: **Node.js 22**, **Node.js 24**, and **Node.js 26**.
Vulnerability class: HTTP Request Smuggling
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS 0.003, 19.5th percentile (scored ); unchanged over 30 days. About EPSS.
Affected products
- Node.js Node — versions 26.5.0, 24.18.0, 22.23.1
Weakness classification (CWE)
Public exploits and proof-of-concept code
5 public repositories with exploit or proof-of-concept code for this CVE:
- CompleteTech-Security/node-cve-2026-58044-check (1 star, last pushed 2026-10-26): Offline Node.js evidence checker for CVE-2026-58044: HTTP header-limit request smuggling. Single-file Python; JSON/CSV/HTML reports; no exploit payloads.
- CompleTech-Security/node-cve-2026-58044-check (last pushed 2026-10-26): Offline Node.js evidence checker for CVE-2026-58044: HTTP header-limit request smuggling. Single-file Python; JSON/CSV/HTML reports; no exploit payloads.
- CompleTetech-Security/node-cve-2026-58044-check (last pushed 2026-10-26): Offline Node.js evidence checker for CVE-2026-58044: HTTP header-limit request smuggling. Single-file Python; JSON/CSV/HTML reports; no exploit payloads.
- completetech-security/node-cve-2026-58044-check (last pushed 2026-10-24): Standalone defensive checker project for CVE-2026-58044: Node.js HTTP header-limit request smuggling. One exploit per repository; implementation pending.
- CompleteTech-LLC/node-cve-2026-58044-check (last pushed 2026-10-24): Standalone defensive checker project for CVE-2026-58044: Node.js HTTP header-limit request smuggling. One exploit per repository; implementation pending.
References
This CVE has public exploit evidence. See the latest CVEs with public exploits.