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Vulnerabilities

Security incident · CVE-2025-47279

Undici is an HTTP/1.1 client for Node.js.

Published May 15, 2025 · catalog updated Feb 6, 2026 · Undici is an HTTP/1.1

Check if you run it

No confirmed exploitation is on record for CVE-2025-47279. EPSS is 0.34%. Act only if a listed version of Undici is an HTTP/1.1 is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Undici is an HTTP/1.1).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Low3.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.34%
Remediation
Version ranges on file
Affected products
vendor nodejs undici 6.0.0, < 6.21.2

Undici is an HTTP/1.1 client for Node.js. Prior to versions 5.29.0, 6.21.2, and 7.5.0, applications that use undici to implement a webhook-like system are vulnerable. If the attacker set up a server with an invalid certificate, and they can force the application to call the webhook repeatedly, then they can cause a memory leak. This has been patched in versions 5.29.0, 6.21.2, and 7.5.0. As a workaound, avoid calling a webhook repeatedly if the webhook fails.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor nodejs undici 6.0.0, < 6.21.26.0.0, < 6.21.2

How to fix CVE-2025-47279

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-47279. EPSS is 0.34%. Act only if a listed version of Undici is an HTTP/1.1 is installed.

Which versions are affected?

Compare what you have installed with nodejs undici 6.0.0, < 6.21.2 6.0.0, < 6.21.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.34%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 15, 2025 · EUVD

    Detected

    Undici is an HTTP/1.1 client for Node.js. Prior to versions 5.29.0, 6.21.2, and 7.5.0, applications that use undici to implement a webhook-like system are vulnerable. If the attacker set up a server with an invalid certificate, and they can force the application to call the webhook repeatedly, then they can cause a memory leak. This has been patched in versions 5.29.0, 6.21.2, and 7.5.0. As a work

  2. Feb 6, 2026 · EUVD

    Updated

    Undici is an HTTP/1.1 client for Node.js. Prior to versions 5.29.0, 6.21.2, and 7.5.0, applications that use undici to implement a webhook-like system are vulnerable. If the attacker set up a server with an invalid certificate, and they can force the application to call the webhook repeatedly, then they can cause a memory leak. This has been patched in versions 5.29.0, 6.21.2, and 7.5.0. As a work

Sources

  • CVE.orgVulnerability recordCVE-2025-47279

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-47279

    30-day exploitation probability 0.3%

    first.org
  • EUVDVulnerability recordEUVD-2025-15389

    Undici is an HTTP/1.1 client for Node.js. Prior to versions 5.29.0, 6.21.2, and 7.5.0, applications that use undici to implement a webhook-like system are vulnerable. If the attacker set up a server with an invalid certificate, and they can force the application to call the webho

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.