What’s Vulnerable › Vulnerabilities

CVE-2026-53954: Bugsink: DOS using large numbers of event tags

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-15 · updated 2026-09-30
• Weakness: CWE-400

Description

Bugsink is a self-hosted error tracking tool. Prior to version 2.2.2, Bugsink stores every set of custom tags supplied with an incoming event, allowing a caller with a valid project DSN to submit an unusually large tag set and force excessive tag-row writes. Because Bugsink uses a single-writer database architecture, the expensive write transaction delays digestion of other events and causes a temporary ingestion denial of service. Version 2.2.2 applies the configurable MAX_EVENT_TAGS limit before storage. The impact is limited to availability for an instance accepting the event and does not expose stored data, modify existing events, or allow code execution. This issue is fixed in version 2.2.2.

Affected products

• bugsink: before 2.2.2

References

• https://github.com/bugsink/bugsink/commit/1d0539fefcd1a796143d15d84053b1c0122ef8c7
• https://github.com/bugsink/bugsink/commit/8dca571b9e66c535ed4885465db820824e7c491a
• https://github.com/bugsink/bugsink/releases/tag/2.2.2
• https://github.com/bugsink/bugsink/security/advisories/GHSA-5x67-j5xg-c5gj

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