OpenJS Foundation Node.js up to 22.23.4/24.22.2/26.13.0 zlib zlib.params denial of service

Summaryinfo

A vulnerability labeled as problematic has been found in OpenJS Foundation Node.js up to 22.23.4/24.22.2/26.13.0. This impacts the function zlib.params of the component zlib. Executing a manipulation can lead to denial of service. This vulnerability appears as CVE-2026-123862. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in OpenJS Foundation Node.js up to 22.23.4/24.22.2/26.13.0 and classified as problematic. This vulnerability affects the function zlib.params of the component zlib. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

An uncatchable exception in the Node.js zlib streaming API lets a peer crash a process by disconnecting while data is being compressed. zlib.params() queues a flush and completes its work in that write's callback; if the stream is destroyed first, as pipeline() does when the peer goes away, Writable still invokes the callback with an error, but the callback ignores its arguments and asserts that the native handle still exists. The handle is gone, so an ERR_INTERNAL_ASSERTION is thrown from inside stream internals and bypasses the stream's error event, the params() callback, and the pipeline() callback, terminating the process. An application is affected only if it calls deflate.params() while streaming to a peer, which is uncommon. This vulnerability affects Node.js 26.x, 24.x, and 22.x.

The advisory is shared for download at nodejs.org. This vulnerability was named CVE-2026-123862 since 11/06/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 22.23.5, 24.22.3 or 26.13.1 eliminates this vulnerability.

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Productinfo

Type

• JavaScript Library

Vendor

• OpenJS Foundation

Name

• Node.js

Version

• 22.23.0
• 22.23.1
• 22.23.2
• 22.23.3
• 22.23.4
• 24.22.0
• 24.22.1
• 24.22.2
• 26.0
• 26.1
• 26.2
• 26.3
• 26.4
• 26.5
• 26.6
• 26.7
• 26.8
• 26.9
• 26.10
• 26.11
• 26.12
• 26.13.0

License

• open-source

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CPE 2.2info

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