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HIGH

CVE-2025-59465

nodejs: Nodejs denial of service

CVSS v3

7.5

HIGH

EPSS Score

4.0 %

exploit probability, as of 2026-09-25

CISA KEV

No

known exploited

Exploitation

none

SSVC status

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) }) }) ```

Technical details

Published
2026-01-20
Last Modified
2026-01-30

Frequently asked questions

What is CVE-2025-59465?

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) }) }) ```

Is CVE-2025-59465 actively exploited?

Active exploitation of CVE-2025-59465 has not been confirmed. Its EPSS score was 4.0% on 2026-09-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-59465?

CVE-2025-59465 has a CVSS v3 base score of 7.5 (HIGH severity).

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