Improper validation of certificate with host mismatch in Node.js - CVE-2026-48928

Vulnerability identifier: #VU135020

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-48928

CWE-ID: CWE-297

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to bypass mTLS authorization.

The vulnerability exists due to case-sensitive hostname matching in SNI context matching when selecting contexts in multi-context mTLS setups. A remote attacker can use an uppercase hostname to bypass mTLS authorization.

Node.js
Anolis OS
nodejs-npm
v8-12.4-devel
nodejs
nodejs-devel
nodejs-full-i18n
nodejs-libs
nodejs-docs

Install security update from vendor's website.

Node.js - addressed in versions 22.23.0, 24.17.0, 26.3.1
nodejs-npm - update to 10.9.8-1.22.23.0.1
v8-12.4-devel - update to 12.4.254.21-1.22.23.0.1
nodejs - update to 22.23.0-1
nodejs-devel - update to 22.23.0-1
nodejs-full-i18n - update to 22.23.0-1
nodejs-libs - update to 22.23.0-1
nodejs-docs - update to 22.23.0-1

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

• Multiple vulnerabilities in Node.js
• Anolis OS update for nodejs