Improper Handling of Case Sensitivity Affecting nodejs/node package, versions [22.0.0, 22.23.0)[23.0.0, 24.17.0)[25.0.0, 26.3.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-NODEJSNODE-17675087
- published29 Jun 2026
- disclosed26 Jun 2026
- credittmeletlidis
Introduced: 26 Jun 2026
CVE-2026-48928 (opens in a new tab)How to fix?
Upgrade nodejs/node to version 22.23.0, 24.17.0, 26.3.1 or higher.
Overview
Affected versions of this package are vulnerable to Improper Handling of Case Sensitivity in the Server.prototype.addContext method of lib/internal/tls/wrap.js, which builds the server name matching regular expression without the case-insensitive flag. An attacker can evade the TLS context bound to a specific hostname, and the client certificate policy attached to it, by sending an uppercase or mixed-case SNI hostname in the ClientHello, which fails to match the configured context and falls back to the server's default context. Exploitation affects servers with multi-context SNI configurations where the default context enforces a weaker client authentication policy than the host-specific context it should have matched.