CVE-2025-64509 HIGH

CVE-2025-64509: Bugsink vulnerable to unauthenticated remote DoS via crafted Brotli input (via CPU)

Vendor Bugsink
Product bugsink
Weakness CWE-770 · Uncontrolled resource consumption
Published November 10, 2025
Last update November 12, 2025
View on NVD All CVEs

CVSS base score

7.5/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

November 10, 2025 CVE published
November 12, 2025 Record updated