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High · 7.5 CVE-2025-64508 EUVD-2025-50818GHSA-fc2v-vcwj-269vPYSEC-2026-1225

Bugsink vulnerable to unauthenticated remote DoS via crafted Brotli input

Published Nov 10, 2025 · Updated Nov 12, 2025 · Assigned by GitHub_M

Description

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 products

VendorProductAffectedFixed
bugsink bugsink < 2.0.5 —

Affected packages

EcosystemPackageAffectedFixedRecord
PyPI bugsink < 2.0.5 2.0.5 GHSA-fc2v-vcwj-269v

References