# CVE-2026-15519: usestrix PyPI system_prompt.jinja inclusion of functionality from untrusted control sphere

> Attackers can inject malicious code via untrusted Jinja templates in the usestrix strix library, potentially leading to remote code execution.

- **Severity:** Low 2.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 13 Jul 2026
- **Updated:** 13 Jul 2026
- **Also known as:** GHSA-9x9x-v3ff-pj74

## What is CVE-2026-15519?

CVE-2026-15519 is a low-severity code injection vulnerability in usestrix strix, published on 13 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A vulnerability was found in usestrix strix up to 1.0.2. This affects an unknown function of the file system_prompt.jinja of the component PyPI Handler. Performing a manipulation results in inclusion of functionality from untrusted control sphere. The attack is possible to be carried out remotely. The complexity of an attack is rather high. The exploitability is reported as difficult. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

Weakness: CWE-829 (Inclusion of Functionality from Untrusted Control Sphere)

## Which versions are affected by CVE-2026-15519?


## How do I fix CVE-2026-15519?

No fix has been published for CVE-2026-15519 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-15519 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15519 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15519 and fix it if it is affected.

What it is: CVE-2026-15519 is a low-severity code injection vulnerability in usestrix strix, published on 13 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15519 exists.

Affected product: usestrix strix. 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-2026-15519/ (Markdown: https://insights.sbomify.com/CVE-2026-15519/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15519
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15519
- OSV: https://osv.dev/vulnerability/CVE-2026-15519

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15519/
Summaries are generated and may contain mistakes; the official description above is the record.