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Node.js CVE-2026-48618

| EUVDEUVD-2026-39610 MEDIUM
Improper Handling of Unicode Encoding (CWE-176)
2026-06-18 GHSA-g57m-hr98-5m89
Information Disclosure Red Hat Suse Node Js
6.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
vuln.today AI
6.8 MEDIUM

Network client flaw requiring MITM/crafted-name positioning (AC:H), no auth on the client side (PR:N); trusting a wrong server breaks the TLS trust boundary (S:C) and exposes data (C:H) without integrity/availability impact.

3.1 AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
7.4 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Red Hat
7.7 HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

6
Severity Changed
Jun 26, 2026 - 20:22 NVD
HIGH MEDIUM
CVSS changed
Jun 26, 2026 - 20:22 NVD
7.7 (HIGH) 6.5 (MEDIUM)
Source Code Evidence Fetched
Jun 26, 2026 - 02:23 vuln.today
Analysis Generated
Jun 26, 2026 - 02:23 vuln.today
CVSS changed
Jun 26, 2026 - 02:22 NVD
7.7 (HIGH)
CVE Published
Jun 18, 2026 - 04:37 github-releases
UNKNOWN (no severity yet)

Description PRE-NVD

Disclosed via GitHub release of nodejs/node. NVD scoring and full description are pending.

AnalysisAI

Improper hostname normalization in Node.js TLS server-identity verification (fixed in v26.3.1) lets a TLS peer's hostname be evaluated without proper Unicode/case normalization, so identity checks may match a host they should reject. Rated High by the Node.js team (CVSS 7.7, scope-changed, confidentiality-only), it can cause a client to trust the wrong server and expose data carried over the connection. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Position as MITM on victim's TLS path
Delivery
Present cert with non-normalized hostname
Exploit
Bypass server identity check
Execution
Victim trusts attacker server
Impact
Exfiltrate transmitted confidential data
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Vulnerability AssessmentAI

Exploitation Exploitation targets Node.js applications performing TLS server-identity verification, and depends on the attacker being able to present a peer certificate whose hostname representation exploits the missing normalization (Unicode-equivalent or case/encoding variant of the expected name) so that the identity check incorrectly matches. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The supplied CVSS:3.0 vector (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N, 7.7) emphasizes a network-reachable, scope-changing confidentiality breach with no integrity or availability impact, consistent with a client trusting an unintended TLS server and leaking data. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker positioned to intercept a victim Node.js application's outbound TLS connection (e.g., on a shared network or via DNS/routing manipulation) presents a certificate whose name, in a non-normalized Unicode or case form, slips through the flawed identity check. The Node.js client accepts the connection as the intended server and transmits sensitive data (credentials, tokens, API payloads) to the attacker-controlled endpoint. …
Remediation Vendor-released patch: upgrade to Node.js 26.3.1 (or the corresponding patched build for your maintained release line as listed in the Node.js June 2026 security release notes at https://nodejs.org/en/blog/vulnerability/june-2026-security-releases and https://github.com/nodejs/node/releases/tag/v26.3.1). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all Node.js deployments and identify versions prior to v26.3.1. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 SUSE Linux Enterprise Module for Web and Scripting 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed
SUSE Linux Enterprise Server 15 SP6-LTSS Fixed
SUSE Linux Enterprise Server for SAP Applications 15 SP6 Fixed
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Affected

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CVE-2026-48618 vulnerability details – vuln.today
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