---
id: CVE-2023-6180
aliases:
  - GHSA-pjrj-h4fg-6gm4
title: tokio-boring vulnerable to resource exhaustion via memory leak
summary: tokio-boring vulnerable to resource exhaustion via memory leak
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
vendor: tokio-boring
product: tokio-boring
ecosystem: rust
affected:
  - 'tokio-boring >= 4.0.0, < 4.1.0'
patched:
  - tokio-boring 4.1.0
published: '2023-12-05'
updated: '2026-07-08'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-pjrj-h4fg-6gm4'
references:
  - url: >-
      https://github.com/cloudflare/boring/security/advisories/GHSA-pjrj-h4fg-6gm4
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2023-6180'
  - url: >-
      https://github.com/cloudflare/boring/commit/a32783374f2682e6949fdb713910b1b9f103d3ed
  - url: 'https://github.com/cloudflare/boring'
tags:
  - osv
  - rust
epss: 0.00619
epssPercentile: 0.48285
ingestedAt: '2026-07-09T18:56:37.319Z'
---

## Overview

### Impact
The tokio-boring library in version 4.0.0 is affected by a memory leak issue that can lead to excessive resource consumption and potential DoS by resource exhaustion. The `set_ex_data` function used by the library did not deallocate memory used by pre-existing data in memory each time after completing a TLS connection causing the program to consume more resources with each new connection.

### Patches
The issue is fixed in version 4.1.0 of tokio-boring.

### References
[CVE-2023-6180 at cve.org](https://www.cve.org/CVERecord?id=CVE-2023-6180)


## Affected packages

- `tokio-boring >= 4.0.0, < 4.1.0`

## Remediation

Upgrade to a patched release:

- `tokio-boring 4.1.0`