CVE-2025-59465

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-20 · updated 2026-07-15
Weakness: CWE-400

Description

A malformed `HTTP/2 HEADERS` frame with oversized, invalid `HPACK` data can cause Node.js to crash by triggering an unhandled `TLSSocket` error `ECONNRESET`. Instead of safely closing the connection, the process crashes, enabling a remote denial of service. This primarily affects applications that do not attach explicit error handlers to secure sockets, for example: ``` server.on('secureConnection', socket => { socket.on('error', err => { console.log(err) }) }) ```

Affected products

Node.js: from 20.0.0 before 20.20.0; from 22.0.0 before 22.22.0; from 24.0.0 before 24.13.0; from 25.0.0 before 25.3.0 — fixed in 20.20.0, 22.22.0, 24.13.0, 25.3.0

How to fix

Upgrade to a fixed version: Node.js 20.20.0, 22.22.0, 24.13.0, 25.3.0. Check the vendor advisory for mitigations.

References

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