Medium severity · published Jul 30, 2026
CVE-2026-56850
A flaw in Node.js HTTPS Agent connection reuse can cause PFX object-array key collisions, allowing mutual TLS (mTLS) client identities to be reused across requests configured with…
4.4
CVSS
0.1%
EPSS
No
On KEV
Description
A flaw in Node.js HTTPS Agent connection reuse can cause PFX object-array key collisions, allowing mutual TLS (mTLS) client identities to be reused across requests configured with different client certificates.
This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 0% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NO
node · nodejs
26.5.0 through 26.5.0; 24.18.0 through 24.18.0; 22.23.1 through 22.23.1 · source: vendor
NO
Node.js · Nodejs
22.0 through 22.23.1; 24.0.0 through 24.18.0; 26.0.0 through 26.5.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-56850
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-56850
Vendor Advisory
https://nodejs.org/en/blog/vulnerability/july-2026-security-releases
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