# CVE-2019-25586: Deluge 1.3.15 Denial of Service via URL Field

> Local attackers can crash the Deluge BitTorrent client by inputting an excessively long string into the URL field during torrent addition.

- **Severity:** Medium 6.9 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Mar 2026
- **Updated:** 23 Mar 2026
- **Also known as:** GHSA-rmf4-rvgx-3jfq, PYSEC-2026-39, UBUNTU-CVE-2019-25586

## What is CVE-2019-25586?

CVE-2019-25586 is a medium-severity denial of service vulnerability in Dev Deluge, published on 22 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

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 of 5000 characters into the 'From URL' field during torrent addition to trigger an application crash.

Weakness: CWE-466 (Return of Pointer Value Outside of Expected Range)

## Which versions are affected by CVE-2019-25586?

1 open source package ship an affected version, including deluge. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `deluge` | PyPI | All versions to 1.3.15 | None |

Products: Deluge-Torrent Deluge.

## How do I fix CVE-2019-25586?

No fix has been published for CVE-2019-25586 yet. Limit exposure of the affected software until one is available.

## Is CVE-2019-25586 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25586 exists.

## Other vulnerabilities in Dev Deluge

- [CVE-2017-9031](https://insights.sbomify.com/CVE-2017-9031/): Path traversal in n/a (critical 9.8)
- [CVE-2019-25585](https://insights.sbomify.com/CVE-2019-25585/): Deluge 1.3.15 Denial of Service via Webseeds Field (medium 6.9)
- [CVE-2021-3427](https://insights.sbomify.com/CVE-2021-3427/): Deluge Web-UI vulnerable to XSS through a crafted torrent file (medium 6.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-25586 and fix it if it is affected.

What it is: CVE-2019-25586 is a medium-severity denial of service vulnerability in Dev Deluge, published on 22 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25586 exists.

Affected packages and fixed versions:
- deluge (PyPI): affected all versions up to 1.3.15; no fix listed

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2019-25586/ (Markdown: https://insights.sbomify.com/CVE-2019-25586/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-25586
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-25586
- OSV: https://osv.dev/vulnerability/CVE-2019-25586

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-25586/
Summaries are generated and may contain mistakes; the official description above is the record.