Summary
Authenticated arbitrary file write in artifact bundle assembly
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 issue requires authentication and affects only version 2.1.0.
The issue is fixed in 2.1.1.
Affected versions
- Affected: 2.1.0
- Fixed: 2.1.1
- Not affected: earlier releases
Mitigation
Upgrade to 2.1.1.
As a defense-in-depth measure, deployments should continue to ensure the Bugsink process runs with the minimum required filesystem permissions.
Impact
This vulnerability allows an authenticated user to create or overwrite files within locations writable by the Bugsink service account.
The practical impact depends on the deployment environment and filesystem permissions of the running process.
Possible consequences include:
- modification of application data files
- corruption of uploaded assets or temporary files
- overwriting files in mounted writable volumes
- disruption of normal application behavior
No unauthenticated exploitation is known.
No direct code execution has been demonstrated as part of this issue, though impact may be greater in deployments where the process has broad write permissions.
The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths. Typical impact: varies by context: data corruption, logic bypass, or denial of service.
CVE-2026-40162 has a CVSS score of 7.1 (High). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (2.1.1); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
Kodem Kai can prioritize this vulnerability in your dependency tree and generate a fix recommendation.
Frequently Asked Questions
- What is CVE-2026-40162? CVE-2026-40162 is a high-severity improper input validation vulnerability in bugsink (pip), affecting versions = 2.1.0. It is fixed in 2.1.1. The application does not adequately validate input before processing it, allowing unexpected values to reach sensitive code paths.
- How severe is CVE-2026-40162? CVE-2026-40162 has a CVSS score of 7.1 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of bugsink are affected by CVE-2026-40162? bugsink (pip) versions = 2.1.0 is affected.
- Is there a fix for CVE-2026-40162? Yes. CVE-2026-40162 is fixed in 2.1.1. Upgrade to this version or later.
- Is CVE-2026-40162 exploitable, and should I be worried? Whether CVE-2026-40162 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-40162 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-40162? Upgrade
bugsinkto 2.1.1 or later.