CVE-2026-48930: A flaw in Node.js TLS hostname handling can cause Embedded-nul hostnames can lead to silent authority rebindin

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CRITICAL 9.8REMOTEDOWNGRADE

CVE-2026-48930 is a critical-severity flaw (CVSS 9.8) affecting node.js. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw in Node.js TLS hostname handling can cause Embedded-nul hostnames can lead to silent authority rebinding due to c-string truncation in resolver bindings. This vulnerability affects all supported release lines: **Node.js 22**, **Node.js 24**, and **Node.js 26**.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 76%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-06-26
Last modified	2026-10-25

Publisher (CNA): HackerOne · Vendor: nodejs

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-26 02:16 UTCPublished CVE record published
2026-10-25 22:10 UTCUpdated Record last modified

nodejs node.js DOWNGRADE

Affected: 22.22.3 · 24.16.0 · 26.3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 22.22.3

1. Check installed version

apt-cache policy node.js || rpm -q node.js || node.js --version

2. No fixed release: DOWNGRADE to a release before 22.22.3 (Debian / Ubuntu)

apt-cache madison node.js sudo apt install node.js=<VERSION_BEFORE_22.22.3> sudo apt-mark hold node.js

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list node.js sudo dnf downgrade node.js-<VERSION_BEFORE_22.22.3> sudo dnf versionlock add node.js

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-48930?

node.js: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-48930 being exploited?

CVE-2026-48930 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-48930 affect?

CVE-2026-48930 affects node.js. Severity is critical (CVSS 9.8). A flaw in Node.js TLS hostname handling can cause Embedded-nul hostnames can lead to silent authority rebinding due to c-string truncation in resolver bindings. This vulnerability affects all supported release lines: **Node.js 22**, **No

How urgent is CVE-2026-48930?

Priority 45/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Node.js vulnerabilities

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References

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