GHSA-fg72-q65g-wm5w: Duplicate Advisory Denial of Service Vulnerability

HIGH
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CVSS 7.5
CWE-400
Published
Advisory Summary

GHSA-fg72-q65g-wm5w is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Duplicate Advisory libraries in the npm ecosystem. The issue involves h3: unbounded chunked cookie count in session cleanup loop may lead to denial of service. Remediation is available in the latest vendor maintenance releases.

GHSA-fg72-q65g-wm5w at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-fg72-q65g-wm5w
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Duplicate Advisory
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.5

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

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

How to Fix GHSA-fg72-q65g-wm5w

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

h3 fixed: Latest secure release 
npm install h3@Latest secure release
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 h3

How to Check if You Are Affected

To determine whether your Node.js application is affected by GHSA-fg72-q65g-wm5w, inspect your project dependencies using npm:

npm ls h3

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

Note: The npm ls h3 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-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Duplicate Advisory, 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

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-q5pr-72pq-83v3. This link is maintained to preserve external references. ## Original Description h3 versions before 2.0.1-rc.18 fail to validate the chunk count parsed from user-controlled cookie values in setChunkedCookie() and deleteChunkedCookie() functions. Attackers can send a crafted cookie header with an extremely large chunk count to trigger an O(n²) cleanup loop that hangs the server process.

GHSA-fg72-q65g-wm5w Affected Duplicate Advisory Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
h3
npm/h3
npm
≥ 2.0.0-beta.4

References

GitHub Advisory / Wiki ADVISORY
https://github.com/h3js/h3/security/advisories/GHSA-q5pr-72pq-83v3
NVD — GHSA-fg72-q65g-wm5w NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-86250
www.vulncheck.com/advisories/h3-befor... WEB
https://www.vulncheck.com/advisories/h3-before-2.0.1-rc.18-denial-of-service-via-unbounded-chunked-cookie

Frequently Asked Questions

What is GHSA-fg72-q65g-wm5w?
GHSA-fg72-q65g-wm5w is a security vulnerability in Duplicate Advisory involving H3: Unbounded Chunked Cookie Count in Session Cleanup Loop may Lead to Denial of Service under CWE-400: Uncontrolled Resource Consumption.
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to current release patches across affected packages: h3.
What version fixes GHSA-fg72-q65g-wm5w?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is h3 affected?
Yes, h3 is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of GHSA-fg72-q65g-wm5w?
GHSA-fg72-q65g-wm5w has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with GHSA-fg72-q65g-wm5w?
GHSA-fg72-q65g-wm5w is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check npm dependencies for GHSA-fg72-q65g-wm5w?
Run the dependency tree command: 'npm ls h3'. 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-fg72-q65g-wm5w",
  "modified" : "2026-09-30T23:46:36Z",
  "published" : "2026-09-06T12:30:23Z",
  "withdrawn" : "2026-09-30T23:46:36Z",
  "aliases" : [ ],
  "summary" : "Duplicate Advisory: H3: Unbounded Chunked Cookie Count in Session Cleanup Loop may Lead to Denial of Service",
  "details" : "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-q5pr-72pq-83v3. This link is maintained to preserve external references.\n\n## Original Description\nh3 versions before 2.0.1-rc.18 fail to validate the chunk count parsed from user-controlled cookie values in setChunkedCookie() and deleteChunkedCookie() functions. Attackers can send a crafted cookie header with an extremely large chunk count to trigger an O(n²) cleanup loop that hangs the server process.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "h3"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0-beta.4"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "< 2.0.1-rc.18"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/h3js/h3/security/advisories/GHSA-q5pr-72pq-83v3"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-86250"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/h3-before-2.0.1-rc.18-denial-of-service-via-unbounded-chunked-cookie"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-30T23:46:36Z",
    "nvd_published_at" : "2026-09-06T12:17:15Z"
  }
}