# go.mongodb.org/mongo-driver improperly validates cstrings when marshalling Go objects into BSON

Advisory record · `GHSA-f6mq-5m25-4r72`

- **Identifiers:** `GHSA-f6mq-5m25-4r72` · `CVE-2021-20329` · `GO-2021-0112`
- **State:** Confirmed
- **Severity:** CVSS 6.8 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-20](https://cwe.mitre.org/data/definitions/20.html) · [CWE-1287](https://cwe.mitre.org/data/definitions/1287.html)
- **Tags:** [CWE-20](https://agentprime.io/advisories/tag/cwe-20.md) · [CWE-1287](https://agentprime.io/advisories/tag/cwe-1287.md)
- **Published:** 15 Jun 2021
- **Updated:** 17 Sept 2024
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 15 Jun 2021, 16:08 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `go.mongodb.org/mongo-driver` (Go): affected `<1.5.1`; fixed in `1.5.1`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.8 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N`, from CNA (mongodb)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0094, the 60th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 15 Jun 2021. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-f6mq-5m25-4r72](https://github.com/advisories/GHSA-f6mq-5m25-4r72)
- [OSV: GHSA-f6mq-5m25-4r72](https://osv.dev/vulnerability/GHSA-f6mq-5m25-4r72)
- <https://nvd.nist.gov/vuln/detail/CVE-2021-20329>
- <https://github.com/mongodb/mongo-go-driver/pull/622>
- <https://github.com/mongodb/mongo-go-driver/commit/2aca31d5986a9e1c65a92264736de9fdc3b9b4ca>
- <https://github.com/mongodb/mongo-go-driver>
- <https://github.com/mongodb/mongo-go-driver/releases/tag/v1.5.1>
- <https://jira.mongodb.org/browse/GODRIVER-1923>
- <https://pkg.go.dev/vuln/GO-2021-0112>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-f6mq-5m25-4r72>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-f6mq-5m25-4r72/>. Everything for agents: <https://agentprime.io/llms.txt>.