# CVE-2026-15331: zhayujie CowAgent Skill Installation service.py _add_package path traversal

> Attackers can exploit path traversal in CowAgent's skill installation handler to read or modify arbitrary files remotely.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Jul 2026
- **Updated:** 10 Jul 2026
- **Also known as:** GHSA-c3mj-x5cv-cphr

## What is CVE-2026-15331?

CVE-2026-15331 is a medium-severity path traversal vulnerability in zhayujie CowAgent, published on 10 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was identified in zhayujie CowAgent up to 2.1.0. The affected element is the function _add_url/_add_package of the file agent/skills/service.py of the component Skill Installation Handler. The manipulation of the argument Name leads to path traversal. The attack may be initiated remotely. Upgrading to version 2.1.2 is sufficient to fix this issue. The identifier of the patch is e85290cddcbb5ffc9c235927f4c92e5b4c3ec264. It is advisable to upgrade the affected component.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-15331?


## How do I fix CVE-2026-15331?

No fix has been published for CVE-2026-15331 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-15331 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15331 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15331 and fix it if it is affected.

What it is: CVE-2026-15331 is a medium-severity path traversal vulnerability in zhayujie CowAgent, published on 10 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15331 exists.

Affected product: zhayujie CowAgent. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-15331/ (Markdown: https://insights.sbomify.com/CVE-2026-15331/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15331
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15331
- OSV: https://osv.dev/vulnerability/CVE-2026-15331

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15331/
Summaries are generated and may contain mistakes; the official description above is the record.