VulnerabilityAwaiting Analysis

CVE-2026-58045

A flaw in Node.js allows a spoofed `TypedArray` `byteLength` to trigger a reachable assertion in the synchronous `node:zlib` APIs, causing the entire process to crash.

MEDIUM 6.2EPSS 0.17%

Does this matter?

Lower severity and a low EPSS score (0.17%). Track it; it rarely justifies an emergency change on its own.

Description

A flaw in Node.js allows a spoofed `TypedArray` `byteLength` to trigger a reachable assertion in the synchronous `node:zlib` APIs, causing the entire process to crash. All 11 synchronous zlib functions are affected. Repeated exploitation of this condition can result in a denial of service. This vulnerability affects Node.js **22.x**, **24.x**, and **26.x**.

CVSS 3.0: 6.2 MEDIUMCVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 0.17% probability · 6th percentile
CISA KEV: Not listed
Weakness: CWE-400
Source: support@hackerone.com

References

https://nodejs.org/en/blog/vulnerability/july-2026-security-releases

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.