CVE-2026-40162 Bugsink affected by authenticated arbitrary file write in artifactbundle/assemble
Authenticated attackers can write arbitrary files to the server via the artifact bundle assembly flow in Bugsink, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-40162?
CVE-2026-40162 is a high-severity vulnerability in bugsink, published on 10 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Bugsink is a self-hosted error tracking tool. In 2.1.0, an authenticated file write vulnerability was identified in Bugsink 2.1.0 in the artifact bundle assembly flow. A user with a valid authentication token could cause the application to write attacker-controlled content to a filesystem location writable by the Bugsink process. This vulnerability is fixed in 2.1.1.
Weakness: CWE-20
Which versions are affected by CVE-2026-40162?
3 open source packages ship an affected version, including bugsink. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
bugsink PyPI | From 2.1.0 | 2.1.1 |
bugsink PyPI | From 2.1.0 | 2.1.1 |
bugsink PyPI | From 2.1.0 | 2.1.1 |
Products include Bugsink Bugsink.
How do I fix CVE-2026-40162?
Upgrade bugsink to 2.1.1 or later.
Is CVE-2026-40162 being exploited?
There is no known exploitation of CVE-2026-40162 in the wild and no public exploit code.
Other vulnerabilities in bugsink
Sources
Also known as GHSA-8hw4-fhww-273g, PYSEC-2026-2404.