#VU109244 Memory leak in undici - CVE-2025-47279

Vulnerability identifier: #VU109244

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-47279

CWE-ID: CWE-401

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
undici
Server applications / File servers (FTP/HTTP)

Vendor: Node.js

Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due memory leak when handling invalid certificates. A remote attacker can force the application to leak memory and perform denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

undici: 5.0.0 - 7.4.0

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External links
https://github.com/nodejs/undici/issues/3895
https://github.com/nodejs/undici/pull/4088
https://github.com/nodejs/undici/security/advisories/GHSA-cxrh-j4jr-qwg3

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.