# CVE-2026-100265: Supply chain in Rider

> Attackers can execute arbitrary code via auto-updated third-party skills in JetBrains Rider without user confirmation.

- **Severity:** Medium 4.8 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Sep 2026
- **Updated:** 30 Sep 2026
- **Also known as:** GHSA-f82x-3h7v-827j

## What is CVE-2026-100265?

CVE-2026-100265 is a medium-severity vulnerability in JetBrains Rider, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In JetBrains Rider before 2026.2.1 aI Assistant could auto-update third-party skills without user confirmation

Weakness: CWE-494 (Download of Code Without Integrity Check)

## Which versions are affected by CVE-2026-100265?

It affects 1 product.


Products: Jetbrains Rider.

## How do I fix CVE-2026-100265?

No fix has been published for CVE-2026-100265 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-100265 being exploited?

There is no known exploitation of CVE-2026-100265 in the wild and no public exploit code.

## Other vulnerabilities in JetBrains Rider

- [CVE-2019-14960](https://insights.sbomify.com/CVE-2019-14960/): Supply chain in n/a (high 7.8)
- [CVE-2020-7906](https://insights.sbomify.com/CVE-2020-7906/): Security feature bypass in n/a (high 7.5)
- [CVE-2025-43016](https://insights.sbomify.com/CVE-2025-43016/): Path traversal in Rider (medium 5.4)
- [CVE-2022-37396](https://insights.sbomify.com/CVE-2022-37396/): Security feature bypass in Rider (medium 4.1)
- [CVE-2024-24939](https://insights.sbomify.com/CVE-2024-24939/): Information disclosure in Rider (low 3.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-100265 and fix it if it is affected.

What it is: CVE-2026-100265 is a medium-severity vulnerability in JetBrains Rider, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-100265 in the wild and no public exploit code.

Affected product: JetBrains Rider. 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-2026-100265/ (Markdown: https://insights.sbomify.com/CVE-2026-100265/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-100265
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-100265
- OSV: https://osv.dev/vulnerability/CVE-2026-100265

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-100265/
Summaries are generated and may contain mistakes; the official description above is the record.