TI-2026-28977 Aliases CVE-2026-40162 GHSA-8hw4-fhww-273g

Bugsink affected by authenticated arbitrary file write in artifactbundle/assemble

LOW 31CWE-20Published 2026-04-10 · Updated 2026-04-10

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · High · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0031 24th percentileScored 2026-11-07

Fix Fixed bugsink (bugsink): 2.1.1bugsink (PyPI): 2.1.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
bugsink	bugsink	2.1.0 to before 2.1.1	2.1.1	Patch available	CNA
—	bugsink (PyPI)	2.1.0 to before 2.1.1	2.1.1	Patch available	GHSA-8hw4-fhww-273g

bugsink Vendorbugsink Affected 2.1.0 to before 2.1.1 Fixed in 2.1.1 Patch available CNA
bugsink (PyPI) Vendor— Affected 2.1.0 to before 2.1.1 Fixed in 2.1.1 Patch available GHSA-8hw4-fhww-273g

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:bugsink:bugsink:2.1.0:::::::*	2.1.0	Vulnerable	bugsink

cpe:2.3:a:bugsink:bugsink:2.1.0:*:*:*:*:*:*:* Versions 2.1.0 Vulnerable ·bugsink

Remediation

Fix · CNA bugsink (bugsink) Fixed in 2.1.1
Fix · GHSA-8hw4-fhww-273g bugsink (PyPI) Fixed in 2.1.1 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-40162
2026-10-03 Alias added: GHSA-8hw4-fhww-273g

References

Advisory 2

Other 2

TI-2026-22000 Bugsink is vulnerable to Stored XSS via Pygments fallback in stacktrace rendering CVSS 3.1CRITICAL 9.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences