CVE-2026-48930Network attack vector

Authority rebinding via embedded-NUL hostname truncation

Published Jun 26, 2026 · Updated Jun 26, 2026

Improper access control in Node.js 22.22.3, 24.16.0, and 26.3.0 allows remote attackers to rebind TLS authority via crafted hostnames. The dns.lookup, dns.promises.lookup, and net connection paths accepted JavaScript strings containing a NUL byte, while native resolver bindings treated that byte as the end of the C string. Exploitation requires an application to accept an attacker-controlled hostname and trust text after the NUL during an authority check, causing resolution to use the attacker-selected prefix.

CVSS severity5.6
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Node.js 22.22.3, 24.16.0, and 26.3.0 allows remote attackers to rebind TLS authority via crafted hostnames. The dns.lookup, dns.promises.lookup, and net connection paths accepted JavaScript strings containing a NUL byte, while native resolver bindings treated that byte as the end of the C string. Exploitation requires an application to accept an attacker-controlled hostname and trust text after the NUL during an authority check, causing resolution to use the attacker-selected prefix.

The record

CVE
CVE-2026-48930
Published
Jun 26, 2026
Updated
Jun 26, 2026
Vendor
Node.js
Product
Node.js
Classifications
CWE-284
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=22.22.3 <=22.22.3
  2. Affected versionversion=24.16.0 <=24.16.0
  3. Affected versionversion=26.3.0 <=26.3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Node.js · Node.jsversion=22.22.3 <=22.22.3; version=24.16.0 <=24.16.0; version=26.3.0 <=26.3.0

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.6HackerOneCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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