High severity · published Jan 20, 2026
CVE-2025-59464
A memory leak in Node.js’s OpenSSL integration occurs when converting `X.509` certificate fields to UTF-8 without freeing the allocated buffer
7.5
CVSS
0.3%
EPSS
No
On KEV
Description
A memory leak in Node.js’s OpenSSL integration occurs when converting `X.509` certificate fields to UTF-8 without freeing the allocated buffer. When applications call `socket.getPeerCertificate(true)`, each certificate field leaks memory, allowing remote clients to trigger steady memory growth through repeated TLS connections. Over time this can lead to resource exhaustion and denial of service.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NO
node · nodejs
24.12.0 before 24.12.0 · source: vendor
NO
Node.js · Nodejs
24.0.0 before 24.12.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-59464
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-59464
Release Notes
https://nodejs.org/en/blog/vulnerability/december-2025-security-releases
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