GHSA-4w2j-m93h-cj5j: Quinn Remote Memory Exhaustion Vulnerability

HIGH
Share
CVSS 7.5
CWE-770
Published
Advisory Summary

GHSA-4w2j-m93h-cj5j is a HIGH (CVSS 7.5) remote memory exhaustion vulnerability (CWE-770: Allocation of Resources Without Limits or Throttling) affecting Quinn libraries in the crates.io ecosystem. The issue involves remote memory exhaustion in quinn-proto from unbounded out-of-order stream reassembly. Remediation is available by upgrading affected packages to version 0.11.15.

GHSA-4w2j-m93h-cj5j at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-4w2j-m93h-cj5j
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-770: Allocation of Resources Without Limits or Throttling
Affected Product Quinn
Package Ecosystem crates.io
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-4w2j-m93h-cj5j

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

quinn-proto fixed: 0.11.15 
Upgrade quinn-proto to 0.11.15
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 quinn-proto

How to Check if You Are Affected

To determine whether your application is affected by GHSA-4w2j-m93h-cj5j, inspect your project dependencies for Quinn:

inspect dependencies for quinn-proto

Analyze the terminal output to locate any version of Quinn in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.11.15), 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-770: Allocation of Resources Without Limits or Throttling, where the product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated. In Quinn, 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

## Summary The `Assembler` component that assembles unordered stream fragments into consecutive chunks of the stream incurs some overhead for non-contiguous fragments. Readers that read from a `RecvStream` in order (through an `AsyncRead` impl for example) will be sensitive to peers that send fragments while leaving out early parts of the stream, and in particular, fragments with many gaps (because these cannot be defragmented). In such a scenario, the receiving connection suffers from high buffer overhead, enabling memory exhaustion.

GHSA-4w2j-m93h-cj5j Affected Quinn Versions

1 component(s)
Fixed Versions:
0.11.15
Product / Package Ecosystem Affected Versions Fixed Version
quinn-proto
 crates.io
≥ 0.1.0
< 0.11.15
0.11.15

References

GitHub Advisory / Wiki ADVISORY
https://github.com/quinn-rs/quinn/security/advisories/GHSA-4w2j-m93h-cj5j
Quinn Source Repository REPOSITORY
https://github.com/quinn-rs/quinn/pull/2694
Security Fix Commit FIX COMMIT
https://github.com/quinn-rs/quinn/commit/fed0321a9a672819662caab37f5662f1ad91308e
Quinn Source Repository REPOSITORY
https://github.com/quinn-rs/quinn
Quinn Release RELEASE
https://github.com/quinn-rs/quinn/releases/tag/quinn-proto-0.11.15
rustsec.org/advisories/rustsec-... WEB
https://rustsec.org/advisories/RUSTSEC-2026-0185.html

Frequently Asked Questions

What is GHSA-4w2j-m93h-cj5j?
GHSA-4w2j-m93h-cj5j is a security vulnerability in Quinn involving Remote memory exhaustion in quinn-proto from unbounded out-of-order stream reassembly under CWE-770: Allocation of Resources Without Limits or Throttling.
Which Quinn versions are affected?
Affected versions include releases prior to 0.11.15 across affected packages: quinn-proto.
What version fixes GHSA-4w2j-m93h-cj5j?
Upgrading to 0.11.15 (or the latest patched release for your respective branch) resolves the vulnerability.
Is quinn-proto affected?
Yes, quinn-proto is affected in releases prior to 0.11.15. Upgrade your dependency to 0.11.15 or later.
What is the CVSS score of GHSA-4w2j-m93h-cj5j?
GHSA-4w2j-m93h-cj5j 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-4w2j-m93h-cj5j?
GHSA-4w2j-m93h-cj5j is classified under CWE-770: Allocation of Resources Without Limits or Throttling (The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.).
How can I check crates.io dependencies for GHSA-4w2j-m93h-cj5j?
Run the dependency tree command: 'inspect dependencies for quinn-proto'. 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-4w2j-m93h-cj5j",
  "modified" : "2026-07-24T14:07:54Z",
  "published" : "2026-07-24T14:07:54Z",
  "aliases" : [ ],
  "summary" : "Quinn: Remote memory exhaustion in quinn-proto from unbounded out-of-order stream reassembly",
  "details" : "## Summary\n\nThe `Assembler` component that assembles unordered stream fragments into consecutive chunks of the stream incurs some overhead for non-contiguous fragments. Readers that read from a `RecvStream` in order (through an `AsyncRead` impl for example) will be sensitive to peers that send fragments while leaving out early parts of the stream, and in particular, fragments with many gaps (because these cannot be defragmented). In such a scenario, the receiving connection suffers from high buffer overhead, enabling memory exhaustion.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "crates.io",
      "name" : "quinn-proto"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0.1.0"
      }, {
        "fixed" : "0.11.15"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/quinn-rs/quinn/security/advisories/GHSA-4w2j-m93h-cj5j"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/quinn-rs/quinn/pull/2694"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/quinn-rs/quinn/commit/fed0321a9a672819662caab37f5662f1ad91308e"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/quinn-rs/quinn"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/quinn-rs/quinn/releases/tag/quinn-proto-0.11.15"
  }, {
    "type" : "WEB",
    "url" : "https://rustsec.org/advisories/RUSTSEC-2026-0185.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-770" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-24T14:07:54Z",
    "nvd_published_at" : null
  }
}