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Node.js CVE-2026-48933

| EUVDEUVD-2026-39609 HIGH
Integer Overflow or Wraparound (CWE-190)
2026-06-18 GHSA-pvpp-9x2p-fxg3
Information Disclosure Integer Overflow Node Js
7.5
CVSS 3.1 · Vendor
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Severity by source

Vendor (CNA) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
7.5 HIGH

Network-reachable WebCrypto operation, no auth or interaction (PR:N/UI:N/AC:L); integer overflow yields a process crash, so availability-only (A:H, C:N/I:N).

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

Primary rating from Vendor (CNA).

CVSS VectorVendor

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

Lifecycle Timeline

5
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
7.5 (HIGH)
CVE Published
Jun 18, 2026 - 04:37 github-releases
HIGH 7.5
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

Denial of service in Node.js 26.x (fixed in 26.3.1) arises from an unguarded integer overflow when computing WebCrypto cipher output buffer lengths, allowing remote attackers to crash a process that performs SubtleCrypto encrypt/decrypt operations on attacker-influenced data. Rated High by the Node.js project (CVSS 7.5, availability-only impact). …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach app endpoint using WebCrypto
Exploit
Submit oversized/crafted cipher input
Execution
Trigger integer overflow in output-length calc
Impact
Process abort / denial of service
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target application to invoke the WebCrypto / SubtleCrypto cipher API (subtle.encrypt or subtle.decrypt) on input whose size is influenced by the attacker; the integer overflow is in the cipher output-length computation, so an attacker must be able to supply or trigger an operation with a sufficiently large/crafted length. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 3.0 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H, base 7.5) describes a network-reachable, low-complexity, unauthenticated condition whose sole impact is availability - consistent with a crash/abort rather than data exposure or code execution. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker sends a request to an application endpoint that performs a WebCrypto encrypt or decrypt on attacker-controlled data of an attacker-chosen size; the unguarded output-length calculation overflows and the Node.js process aborts, taking the service offline. Given AV:N/AC:L/PR:N/UI:N, this requires no authentication or user interaction where such an endpoint is reachable. …
Remediation Vendor-released patch: Node.js 26.3.1 - upgrade from 26.x to 26.3.1 (or the corresponding patched build on your release line as listed in the Node.js June 2026 security release advisory at https://nodejs.org/en/blog/vulnerability/june-2026-security-releases). … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: identify all systems running Node.js 26.x, prioritizing production servers and those handling WebCrypto operations. …

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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-2026-48933 vulnerability details – vuln.today
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