CVE-2025-64509

Bugsink vulnerable to unauthenticated remote DoS via crafted Brotli input (via CPU)

State: Published
Severity: 7.5 High
Published: Nov 10, 2025
Updated: Nov 12, 2025
Reserved: Nov 5, 2025

Description

Bugsink is a self-hosted error tracking tool. In versions prior to 2.0.6, a specially crafted Brotli-compressed envelope can cause Bugsink to spend excessive CPU time in decompression, leading to denial of service. This can be done if the DSN is known, which it is in many common setups (JavaScript, Mobile Apps). The issue is patched in Bugsink 2.0.6. The vulnerability is similar to, but distinct from, another brotli-related problem in Bugsink, GHSA-fc2v-vcwj-269v/CVE-2025-64508.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	GitHub_M

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
bugsinkbugsink	< 2.0.6Affected

References

https://github.com/bugsink/bugsink/security/advisories/GHSA-rrx3-2x4g-mq2h

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