# CVE-2023-0509: Improper Certificate Validation in pyload/pyload

> Attackers can bypass certificate validation in pyload, enabling man-in-the-middle attacks against secure connections.

- **Severity:** High 7.4 (`CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Jan 2023
- **Updated:** 31 Mar 2025
- **Also known as:** GHSA-8v53-23mx-hcf9, PYSEC-2026-903

## What is CVE-2023-0509?

CVE-2023-0509 is a high-severity vulnerability in pyload/pyload, published on 26 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Improper Certificate Validation in GitHub repository pyload/pyload prior to 0.5.0b3.dev44.

Weakness: CWE-295 (Improper Certificate Validation)

## Which versions are affected by CVE-2023-0509?

3 open source packages ship an affected version, including pyload-ng. It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `pyload-ng` | PyPI | All versions | 0.5.0b3.dev44 |
| `pyload-ng` | PyPI | All versions | 0.5.0b3.dev44 |
| `pyload-ng` | PyPI | All versions | 0.5.0b3.dev44 |

Products: Pyload-Ng Project Pyload-Ng, Pyload Pyload.

## How do I fix CVE-2023-0509?

Upgrade pyload-ng to 0.5.0b3.dev44 or later.

## Is CVE-2023-0509 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-0509 exists.

## Other vulnerabilities in pyload/pyload

- [CVE-2025-54802](https://insights.sbomify.com/CVE-2025-54802/): pyLoad CNL Blueprint is vulnerable to Path Traversal through `dlc_path` leading to Remote Code Execution (RCE) (critical 9.8)
- [CVE-2024-22416](https://insights.sbomify.com/CVE-2024-22416/): Cross-Site Request Forgery on any API call in pyLoad may lead to admin privilege escalation (critical 9.7)
- [CVE-2023-0488](https://insights.sbomify.com/CVE-2023-0488/): Cross-site Scripting (XSS) - Stored in pyload/pyload (critical 9.6)
- [CVE-2026-35459](https://insights.sbomify.com/CVE-2026-35459/): pyLoad has SSRF fix bypass via HTTP redirect (critical 9.3)
- [CVE-2026-35463](https://insights.sbomify.com/CVE-2026-35463/): pyLoad has Improper Neutralization of Special Elements used in an OS Command (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-0509 and fix it if it is affected.

What it is: CVE-2023-0509 is a high-severity vulnerability in pyload/pyload, published on 26 Jan 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-0509 exists.

Affected packages and fixed versions:
- pyload-ng (PyPI): affected all versions; fixed in 0.5.0b3.dev44
- pyload-ng (PyPI): affected all versions; fixed in 0.5.0b3.dev44
- pyload-ng (PyPI): affected all versions; fixed in 0.5.0b3.dev44

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-2023-0509/ (Markdown: https://insights.sbomify.com/CVE-2023-0509/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-0509
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-0509
- OSV: https://osv.dev/vulnerability/CVE-2023-0509

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-0509/
Summaries are generated and may contain mistakes; the official description above is the record.