CVE-2025-64509

The record

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.

Affected packages

Related vulnerabilities

• GHSA-rrx3-2x4g-mq2h Bugsink is vulnerable to unauthenticated remote DoS via crafted Brotli input (via CPU) Same vulnerability
• GHSA-vp6q-7m36-pq3w Bugsink is vulnerable to Stored XSS via Pygments fallback in stacktrace rendering Also affects bugsink
• CVE-2026-27614 Bugsink is a self-hosted error tracking tool. Also affects bugsink
• GHSA-fc2v-vcwj-269v Bugsink is vulnerable to unauthenticated remote DoS via crafted Brotli input Also affects bugsink
• CVE-2025-64508 Bugsink is a self-hosted error tracking tool. Also affects bugsink
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