GHSA-76v6-f83q-pxvh: Duplicate Advisory Remote Code Execution Vulnerability

HIGH
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CVSS 7.5
CWE-400
Published
Advisory Summary

GHSA-76v6-f83q-pxvh is a HIGH (CVSS 7.5) remote code execution vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Duplicate Advisory libraries in the Hex ecosystem. The issue involves hackney has an allocation of resources without limits or throttling vulnerabilit. Remediation is available by upgrading affected packages to version 4.0.1.

GHSA-76v6-f83q-pxvh at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-76v6-f83q-pxvh
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Duplicate Advisory
Package Ecosystem Hex
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-76v6-f83q-pxvh

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.

hackney fixed: 4.0.1 
Upgrade hackney to 4.0.1
Verify Direct and Transitive Dependencies

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

inspect dependencies for hackney

How to Check if You Are Affected

To determine whether your application is affected by GHSA-76v6-f83q-pxvh, inspect your project dependencies for Duplicate Advisory:

inspect dependencies for hackney

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 4.0.1), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

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-jq4m-q6p2-8gwc. This link is maintained to preserve external references. ## Original Description Allocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. hackney_h3:await_response_loop/6 accumulates the HTTP/3 response body in memory without any size cap. The after Timeout clause is a per-message inactivity timer that resets on every received chunk, housekeeping message, or settings frame — it is not a wall-clock deadline. A malicious HTTP/3 server that emits one small chunk every Timeout - 1 ms with Fin = false and never sends a final frame keeps the loop alive indefinitely while the accumulation buffer grows linearly without bound, eventually exhausting the BEAM process heap and causing an out-of-memory condition. This issue affects hackney: from 2.0.0 before 4.0.1.

GHSA-76v6-f83q-pxvh Affected Duplicate Advisory Versions

1 component(s)
Fixed Versions:
4.0.1
Product / Package Ecosystem Affected Versions Fixed Version
hackney
 Hex
≥ 2.0.0
< 4.0.1
4.0.1

References

GitHub Advisory / Wiki ADVISORY
https://github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwc
NVD — GHSA-76v6-f83q-pxvh NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-47077
Security Fix Commit FIX COMMIT
https://github.com/benoitc/hackney/commit/3d25f9fea26c90609de9d64366fedfe5065413bc
cna.erlef.org/cves/cve-2026-47077... WEB
https://cna.erlef.org/cves/CVE-2026-47077.html
Duplicate Advisory Source Repository REPOSITORY
https://github.com/benoitc/hackney
osv.dev/vulnerability/eef-c... WEB
https://osv.dev/vulnerability/EEF-CVE-2026-47077

Frequently Asked Questions

What is GHSA-76v6-f83q-pxvh?
GHSA-76v6-f83q-pxvh is a security vulnerability in Duplicate Advisory involving Hackney has an Allocation of Resources Without Limits or Throttling vulnerabilit under CWE-400: Uncontrolled Resource Consumption.
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to 4.0.1 across affected packages: hackney.
What version fixes GHSA-76v6-f83q-pxvh?
Upgrading to 4.0.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is hackney affected?
Yes, hackney is affected in releases prior to 4.0.1. Upgrade your dependency to 4.0.1 or later.
What is the CVSS score of GHSA-76v6-f83q-pxvh?
GHSA-76v6-f83q-pxvh 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-76v6-f83q-pxvh?
GHSA-76v6-f83q-pxvh 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 Hex dependencies for GHSA-76v6-f83q-pxvh?
Run the dependency tree command: 'inspect dependencies for hackney'. 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-76v6-f83q-pxvh",
  "modified" : "2026-06-30T17:15:56Z",
  "published" : "2026-05-26T13:30:46Z",
  "withdrawn" : "2026-06-30T17:15:56Z",
  "aliases" : [ ],
  "summary" : "Duplicate Advisory: Hackney has an Allocation of Resources Without Limits or Throttling vulnerabilit",
  "details" : "## Duplicate Advisory\n\nThis advisory has been withdrawn because it is a duplicate of GHSA-jq4m-q6p2-8gwc. This link is maintained to preserve external references.\n\n## Original Description\nAllocation of Resources Without Limits or Throttling vulnerability in benoitc hackney allows Flooding. hackney_h3:await_response_loop/6 accumulates the HTTP/3 response body in memory without any size cap. The after Timeout clause is a per-message inactivity timer that resets on every received chunk, housekeeping message, or settings frame — it is not a wall-clock deadline. A malicious HTTP/3 server that emits one small chunk every Timeout - 1 ms with Fin = false and never sends a final frame keeps the loop alive indefinitely while the accumulation buffer grows linearly without bound, eventually exhausting the BEAM process heap and causing an out-of-memory condition.\n\nThis issue affects hackney: from 2.0.0 before 4.0.1.",
  "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:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Hex",
      "name" : "hackney"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "4.0.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/benoitc/hackney/security/advisories/GHSA-jq4m-q6p2-8gwc"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-47077"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/benoitc/hackney/commit/3d25f9fea26c90609de9d64366fedfe5065413bc"
  }, {
    "type" : "WEB",
    "url" : "https://cna.erlef.org/cves/CVE-2026-47077.html"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/benoitc/hackney"
  }, {
    "type" : "WEB",
    "url" : "https://osv.dev/vulnerability/EEF-CVE-2026-47077"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-06-30T17:00:40Z",
    "nvd_published_at" : "2026-05-25T15:16:22Z"
  }
}