CVE-2026-120423: undici is an HTTP client for Node.js

Routine

MEDIUM 5.9UPGRADE

CVE-2026-120423 is a medium-severity flaw (CVSS 5.9) affecting undici. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

undici is an HTTP client for Node.js. In versions 7.15.0 through 7.30.1 and 8.0.0 through 8.12.3, fetch verifies Subresource Integrity metadata by splitting the integrity string on a single space, but the SRI grammar separates metadata by ASCII whitespace, which also includes the horizontal tab. An integrity value whose digest is preceded by a tab or other ASCII whitespace is parsed as a single unrecognized token and skipped, and when no recogniz

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-354
Published	2026-11-06
Last modified	2026-11-06

Publisher (CNA): openjs · Vendor: undici · Source: CVE Program record (NVD analysis pending)

Last updated 2026-11-06 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-11-06 10:08 UTCPublished CVE record published
2026-11-06 10:08 UTCUpdated Record last modified

undici undici UPGRADE

Affected: >= 7.15.0 and < 7.30.2 · >= 8.0.0 and < 8.12.4

Fixed in: 7.30.2, 8.12.4

Safe to downgrade to: a release before 7.15.0

1. Check installed version

apt-cache policy undici || rpm -q undici || undici --version

2. UPGRADE to 7.30.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade undici

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade undici

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 7.15.0 (Debian / Ubuntu)

apt-cache madison undici sudo apt install undici=<VERSION_BEFORE_7.15.0> sudo apt-mark hold undici

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

dnf --showduplicates list undici sudo dnf downgrade undici-<VERSION_BEFORE_7.15.0> sudo dnf versionlock add undici

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-2026-120423?

undici: upgrade to 7.30.2, 8.12.4. Exact commands for each OS are on this page.

Is CVE-2026-120423 being exploited?

CVE-2026-120423 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-2026-120423 affect?

CVE-2026-120423 affects undici. Severity is medium (CVSS 5.9). undici is an HTTP client for Node.js. In versions 7.15.0 through 7.30.1 and 8.0.0 through 8.12.3, fetch verifies Subresource Integrity metadata by splitting the integrity string on a single space, but the SRI grammar separates metadata by A

How urgent is CVE-2026-120423?

Priority 21/100. No elevated risk signals yet.

Software pages

Node.js vulnerabilities

Related CVEs

CVE-2026-120415 MEDIUM 5.9 UPGRADE undici is an HTTP client for Node.js
CVE-2026-116592 HIGH 7.4 UPGRADE undici is an HTTP client for Node.js
CVE-2026-120222 MEDIUM 5.9 UPGRADE undici is an HTTP client for Node.js
CVE-2026-120474 MEDIUM 6.5 UPGRADE undici is an HTTP client for Node.js
CVE-2026-109855 HIGH 7.5 UPGRADE undici is an HTTP client library for Node.js

References

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