Description
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**.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| nodejs | node | 22.22.3 – ≤ 22.22.3, 24.16.0 – ≤ 24.16.0, 26.3.0 – ≤ 26.3.0 | — |
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 | nodejs | 24.19.0+dfsg+~cs24.13.3-1 | — |
| Debian 13 | nodejs | No fix yet | — |
| Debian 12 | nodejs | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | nodejs | No fix yet | — |
| Ubuntu 26.04 LTS | nodejs | No fix yet | — |
| Ubuntu 24.04 LTS | nodejs | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | nodejs | No fix yet | — |
| Ubuntu Pro 20.04 LTS | nodejs | No fix yet | — |
| Ubuntu Pro 18.04 LTS | nodejs | No fix yet | — |
| Ubuntu Pro 16.04 LTS | nodejs | No fix yet | — |
| Ubuntu Pro 14.04 LTS | nodejs | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | nodejs22 +6 | 22.23.2-2.3.2.hum1 | RHSA-2026:54436 |
| Red Hat Hardened Images 1 | nodejs22-npm | 10.9.8-1.22.23.2.2.3.2.hum1 | RHSA-2026:54436 |
| Red Hat Hardened Images 1 | nodejs24 +6 | 24.18.1-0.2.2.hum1 | RHSA-2026:54438 |
| Red Hat Hardened Images 1 | nodejs24-npm | 11.16.0-1.24.18.1.0.2.2.hum1 | RHSA-2026:54438 |
| Red Hat Hardened Images 1 | nodejs26 +6 | 26.7.0-1.5.2.hum1 | RHSA-2026:54389 |
| Red Hat Hardened Images 1 | nodejs26-npm | 11.19.0-1.26.7.0.1.5.2.hum1 | RHSA-2026:54389 |
| Red Hat Hardened Images 1 | v8-12.4-devel | 12.4.254.21-1.22.23.2.2.3.2.hum1 | RHSA-2026:54436 |
| Red Hat Hardened Images 1 | v8-14.6-devel | 14.6.202.34-1.26.7.0.1.5.2.hum1 | RHSA-2026:54389 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | nodejs-20 +1 | No fix yet | — |
Advisories 3
- RHSA-2026:54389 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:54436 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- RHSA-2026:54438 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 20, 2026