CVE-2026-21711: A flaw in Node.js Permission Model network enforcement leaves Unix Domain Socket (UDS) server operations witho

Routine

MEDIUM 5.3UPGRADE

CVE-2026-21711 is a medium-severity flaw (CVSS 5.3) 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 Permission Model network enforcement leaves Unix Domain Socket (UDS) server operations without the required permission checks, while all comparable network paths correctly enforce them. As a result, code running under `--permission` without `--allow-net` can create and expose local IPC endpoints, allowing communication with other processes on the same host outside of the intended network restriction boundary. This vulnerab

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 94%)
CISA exploited list	No
Weakness	CWE-284
Published	2026-03-30
Last modified	2026-08-19

Publisher (CNA): HackerOne · Vendor: nodejs

Last updated 2026-08-19 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-30 20:16 UTCPublished CVE record published
2026-08-19 13:52 UTCUpdated Record last modified

nodejs node.js UPGRADE

Affected: < 20.0.0 · >= 25.0.0 and <= 25.8.1

Fixed in: 20.0.0

Safe to downgrade to: a release before 25.0.0

1. Check installed version

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

2. UPGRADE to 20.0.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade node.js

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade node.js

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 25.0.0 (Debian / Ubuntu)

apt-cache madison node.js sudo apt install node.js=<VERSION_BEFORE_25.0.0> sudo apt-mark hold node.js

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list node.js sudo dnf downgrade node.js-<VERSION_BEFORE_25.0.0> 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-2026-21711?

node.js: upgrade to 20.0.0. Exact commands for each OS are on this page.

Is CVE-2026-21711 being exploited?

CVE-2026-21711 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-2026-21711 affect?

CVE-2026-21711 affects node.js. Severity is medium (CVSS 5.3). A flaw in Node.js Permission Model network enforcement leaves Unix Domain Socket (UDS) server operations without the required permission checks, while all comparable network paths correctly enforce them. As a result, code running under `

How urgent is CVE-2026-21711?

Priority 20/100. No elevated risk signals yet.

Software pages

Node.js vulnerabilities

Related CVEs

CVE-2026-48617 HIGH 8.2 UPGRADE A flaw in Node.js Permission Model enforcement allows Bypass via `process.report.writeReport()` Path Misvalida
CVE-2026-48937 HIGH 7.5 UPGRADE A flaw in Node.js HTTP/2 server API can cause servers to keep accepting data even after sending a `GOAWAY` fra
CVE-2026-48931 LOW 3.7 DOWNGRADE A flaw in Node.js HTTP Agent can cause a client to accept as valid a response that is send before the client h
CVE-2026-48933 HIGH 7.5 DOWNGRADE A flaw in Node.js WebCrypto implementation can crash the process if the input of `subtle.encrypt()` is a multi
CVE-2026-48618 MEDIUM 6.5 DOWNGRADE A flaw in Node.js TLS hostname handling can cause Node.js unicode dot separator handling can lead to tls wildc

References

← Back to latest CVEs