# Deluge 1.3.15 contains a denial of service vulnerability that allows local attackers to crash the application by supplying an excessively long string in the URL field. Attackers can paste a buffer ...

Advisory record · `PYSEC-2026-39`

- **Identifiers:** `PYSEC-2026-39` · `CVE-2019-25586`
- **State:** Confirmed
- **Severity:** CVSS 6.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-466](https://cwe.mitre.org/data/definitions/466.html)
- **Tags:** [CWE-466](https://agentprime.io/advisories/tag/cwe-466.md)
- **Published:** 22 Mar 2026
- **Updated:** 21 May 2026
- **Reviewed by a person:** No

Published by OSV at 22 Mar 2026, 01:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `deluge` (PyPI): affected `<=1.3.15`; no fixed version yet

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.9 Medium, CVSS 4.0: `CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`, from CNA (VulnCheck)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0018, the 7th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of OSV, published 22 Mar 2026. New records show when each source confirmed them.

## Sources

- [OSV: PYSEC-2026-39](https://osv.dev/vulnerability/PYSEC-2026-39)
- <http://download.deluge-torrent.org/windows/deluge-1.3.15-win32-py2.7.exe>
- <https://dev.deluge-torrent.org/>
- <https://www.vulncheck.com/advisories/deluge-denial-of-service-via-url-field>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/PYSEC-2026-39>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/PYSEC-2026-39/>. Everything for agents: <https://agentprime.io/llms.txt>.