CVE-2026-48618: A flaw in Node.js TLS hostname handling can cause Node.js unicode dot separator handling can lead to tls wildc

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MEDIUM 6.5DOWNGRADE

CVE-2026-48618 is a medium-severity flaw (CVSS 6.5) 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 Node.js unicode dot separator handling can lead to tls wildcard-depth authentication bypass due to resolver and verifier hostname normalization mismat. This can lead to confidentiality impact or bypass of the intended security boundary under affected configurations. This vulnerability affects all supported release lines: **Node.js 22**, **Node.js 24**, and **Node.js 26**.

Why this priority

No elevated risk signals yet

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

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	3.1% (top 12%)
CISA exploited list	No
Weakness	CWE-176, CWE-289
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.

Advisories and coverage

Official advisories

AlmaLinux Errata: [ALSA-2026:35891] Important: nodejs:24 security, bug fix, and enhancement update 2026-07-07
AlmaLinux Errata: [ALSA-2026:35892] Important: nodejs:22 security, bug fix, and enhancement update 2026-07-07

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-2026-48618?

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

Is CVE-2026-48618 being exploited?

CVE-2026-48618 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-2026-48618 affect?

CVE-2026-48618 affects node.js. Severity is medium (CVSS 6.5). A flaw in Node.js TLS hostname handling can cause Node.js unicode dot separator handling can lead to tls wildcard-depth authentication bypass due to resolver and verifier hostname normalization mismat. This can lead to confidentiality im

How urgent is CVE-2026-48618?

Priority 45/100. No elevated risk signals yet.

Software pages

Node.js vulnerabilities

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CVE-2026-48619 HIGH 7.5 DOWNGRADE A flaw in Node.js HTTP/2 client allows a server to send an unlimited number of ORIGIN frames, which could lead

References

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