CVE-2025-47279: Undici Denial of Service Vulnerability

LOW
Advisory Identifier: GHSA-cxrh-j4jr-qwg3
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CVSS 3.1
CWE-401
Published
Advisory Summary

CVE-2025-47279 is a LOW (CVSS 3.1) denial of service vulnerability (CWE-401: Missing Release of Memory after Effective Lifetime) affecting Undici libraries in the npm ecosystem. The issue involves undici denial of service attack via bad certificate data. Remediation is available by upgrading affected packages to version 5.29.0, 6.21.2, 7.5.0.

CVE-2025-47279 at a Glance

CVE Identifier CVE-2025-47279
GHSA Identifier GHSA-cxrh-j4jr-qwg3
Severity LOW
CVSS v3.1 Base Score 3.1
CWE Classification CWE-401: Missing Release of Memory after Effective Lifetime
Affected Product Undici
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 3.1

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability Low (A:L)

How to Fix CVE-2025-47279

To remediate this vulnerability, upgrade all affected Undici dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

undici fixed: 5.29.0 
npm install undici@5.29.0
undici fixed: 6.21.2 
npm install undici@6.21.2
undici fixed: 7.5.0 
npm install undici@7.5.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls undici

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2025-47279, inspect your project dependencies using npm:

npm ls undici

Analyze the terminal output to locate any version of Undici in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 5.29.0), your application is affected.

Note: The npm ls undici command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-401: Missing Release of Memory after Effective Lifetime, where the product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse. In Undici, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact 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. ### Patches This has been patched in https://github.com/nodejs/undici/pull/4088. ### Workarounds If a webhook fails, avoid keep calling it repeatedly. ### References Reported as: https://github.com/nodejs/undici/issues/3895

CVE-2025-47279 Affected Undici Versions

3 component(s)
Fixed Versions:
5.29.06.21.27.5.0
Product / Package Ecosystem Affected Versions Fixed Version
undici
npm/undici
npm
< 5.29.0
5.29.0
undici
npm/undici
npm
≥ 6.0.0
< 6.21.2
6.21.2
undici
npm/undici
npm
≥ 7.0.0
< 7.5.0
7.5.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/nodejs/undici/security/advisories/GHSA-cxrh-j4jr-qwg3
NVD — CVE-2025-47279 NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-47279
Undici Source Repository REPOSITORY
https://github.com/nodejs/undici/issues/3895
Undici Source Repository REPOSITORY
https://github.com/nodejs/undici/pull/4088
Security Fix Commit FIX COMMIT
https://github.com/nodejs/undici/commit/f317618ec28753a4218beccea048bcf89c36db25
Undici Source Repository REPOSITORY
https://github.com/nodejs/undici

Frequently Asked Questions

What is CVE-2025-47279?
CVE-2025-47279 is a security vulnerability in Undici involving undici Denial of Service attack via bad certificate data under CWE-401: Missing Release of Memory after Effective Lifetime.
Which Undici versions are affected?
Affected versions include releases prior to 5.29.0, 6.21.2, 7.5.0 across affected packages: undici.
What version fixes CVE-2025-47279?
Upgrading to 5.29.0, 6.21.2, 7.5.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is undici affected?
Yes, undici is affected in releases prior to 5.29.0, 6.21.2, 7.5.0. Upgrade your dependency to 5.29.0, 6.21.2, 7.5.0 or later.
What is the CVSS score of CVE-2025-47279?
CVE-2025-47279 has a CVSS v3.1 base score of 3.1 (LOW) with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L.
What CWE is associated with CVE-2025-47279?
CVE-2025-47279 is classified under CWE-401: Missing Release of Memory after Effective Lifetime (The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.).
How can I check npm dependencies for CVE-2025-47279?
Run the dependency tree command: 'npm ls undici'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-cxrh-j4jr-qwg3",
  "modified" : "2026-02-06T21:35:53Z",
  "published" : "2025-05-15T14:15:06Z",
  "aliases" : [ "CVE-2025-47279" ],
  "summary" : "undici Denial of Service attack via bad certificate data",
  "details" : "### Impact\n\nApplications 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. \n\n### Patches\n\nThis has been patched in https://github.com/nodejs/undici/pull/4088.\n\n### Workarounds\n\nIf a webhook fails, avoid keep calling it repeatedly.\n\n### References\n\nReported as: https://github.com/nodejs/undici/issues/3895",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "undici"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "5.29.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "undici"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "6.0.0"
      }, {
        "fixed" : "6.21.2"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "npm",
      "name" : "undici"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "7.0.0"
      }, {
        "fixed" : "7.5.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/nodejs/undici/security/advisories/GHSA-cxrh-j4jr-qwg3"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-47279"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nodejs/undici/issues/3895"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nodejs/undici/pull/4088"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/nodejs/undici/commit/f317618ec28753a4218beccea048bcf89c36db25"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/nodejs/undici"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-401" ],
    "severity" : "LOW",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-05-15T14:15:06Z",
    "nvd_published_at" : "2025-05-15T18:15:38Z"
  }
}