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Node.js CVE-2026-48930

| EUVDEUVD-2026-39614 CRITICAL
Improper Access Control (CWE-284)
2026-06-18 GHSA-g779-8rvr-37xx
Authentication Bypass Red Hat Suse Node Js
Critical
Disputed · 9.8 NVD
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Severity by source

Sources disagree (Medium–Critical)
NVD PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
4.8 MEDIUM

Remote and unauthenticated, but AC:H and only partial C/I impact because a bypass depends on an application using the hostname for a security decision; no availability impact, consistent with the vendor's Medium rating rather than 9.8.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SUSE
5.3 MEDIUM
AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
Red Hat
5.6 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

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

Lifecycle Timeline

9
Analysis Updated
Jun 26, 2026 - 20:28 vuln.today
v3 (cvss_changed)
Analysis Updated
Jun 26, 2026 - 20:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Jun 26, 2026 - 20:22 vuln.today
cvss_changed
Severity Changed
Jun 26, 2026 - 20:22 NVD
MEDIUM CRITICAL
CVSS changed
Jun 26, 2026 - 20:22 NVD
5.6 (MEDIUM) 9.8 (CRITICAL)
Source Code Evidence Fetched
Jun 26, 2026 - 02:25 vuln.today
Analysis Generated
Jun 26, 2026 - 02:25 vuln.today
CVSS changed
Jun 26, 2026 - 02:22 NVD
5.6 (MEDIUM)
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

Hostname validation bypass in Node.js (versions 22.22.3, 24.16.0, and 26.3.0) lets attackers smuggle embedded NUL bytes through the dns and net subsystems, truncating a hostname after the NUL so that application-level allowlists, SNI checks, or destination filters validate one host while the runtime resolves or connects to another. The Node.js project rates this specific issue Medium and shipped the fix in its June 2026 security release; there is no public exploit identified at time of analysis and EPSS exploitation probability is low (0.28%, 20th percentile), and it is not in CISA KEV. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Submit hostname with embedded NUL byte
Delivery
Pass application allowlist on full string
Exploit
dns/net truncates at NUL byte
Execution
Resolve/connect to unintended host
Impact
Bypass access control to restricted target
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Vulnerability AssessmentAI

Exploitation Exploitation requires an application built on the affected Node.js versions (22.22.3, 24.16.0, or 26.3.0) that (1) accepts attacker-influenced hostnames and (2) uses that hostname value in a security-relevant comparison - an SSRF/destination allowlist, SNI/server-identity check, or similar - before handing it to the dns or net modules. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals conflict and must be reconciled before prioritization. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An application accepts a user-supplied URL or hostname, validates it against an allowlist of permitted hosts, then passes it to Node's net or dns API to connect. An attacker submits 'allowed-host.example.com\x00.evil.com'; the JavaScript allowlist check sees the full benign-looking string and passes it, but the resolver/socket truncates at the NUL and connects to 'allowed-host.example.com' (or, reversed, to an attacker host), bypassing intended access control. …
Remediation Vendor-released patch: upgrade to Node.js 26.3.1 on the Current line, or the corresponding patched 24.x and 22.x releases from the same June 2026 batch (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: Identify all Node.js deployments in your infrastructure and determine which are running the affected versions. …

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

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Same weakness CWE-284 – Improper Access Control

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Vendor StatusVendor

SUSE

Severity: Moderate
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-2026-48930 vulnerability details – vuln.today
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