CVE-2025-64508

The record

Bugsink is a self-hosted error tracking tool. In versions prior to 2.0.5, brotli "bombs" (highly compressed brotli streams, such as many zeros) can be sent to the server. Since the server will attempt to decompress these streams before applying various maximums, this can lead to exhaustion of the available memory and thus a 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 version `2.0.5`. The vulnerability is similar to, but distinct from, another brotli-related problem in Bugsink, GHSA-rrx3-2x4g-mq2h/CVE-2025-64509.

Affected packages

Related vulnerabilities

• GHSA-fc2v-vcwj-269v Bugsink is vulnerable to unauthenticated remote DoS via crafted Brotli input 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-rrx3-2x4g-mq2h Bugsink is vulnerable to unauthenticated remote DoS via crafted Brotli input (via CPU) Also affects bugsink
• CVE-2025-64509 Bugsink is a self-hosted error tracking tool. Also affects bugsink
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