CVE-2025-64509CWE-770

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

High · published November 10, 2025

CVSS v3.1
7.5
EPSS
0%
Percentile
25.9
In the wild
Unconfirmed
What it is

⚡ A specially crafted Brotli-compressed envelope is all it takes to turn Bugsink into a CPU hog! Just like a runaway train, this vulnerability can cause significant disruptions in your error tracking tool. 🔥 Picture Bugsink as a busy restaurant kitchen. If someone places an excessively large order all at once, it can gum up the works, causing delays and chaos for everyone waiting on their meals. That’s what this vulnerability does to your CPU! An attacker who knows the Data Source Name (DSN) could exploit this flaw to make Bugsink work excessively hard. This leads to a denial of service, where your error tracking tool could become unresponsive, effectively halting your error monitoring and impacting your application’s reliability!

Put simply

Picture Bugsink as a busy restaurant kitchen. If someone places an excessively large order all at once, it can gum up the works, causing delays and chaos for everyone waiting on their meals. That’s what this vulnerability does to your CPU! This vulnerability in Bugsink allows attackers to create a resource-intensive Brotli-compressed envelope that causes excessive CPU usage during decompression, leading to a denial of service for versions prior to 2.0.6.

What to do

An attacker who knows the Data Source Name (DSN) could exploit this flaw to make Bugsink work excessively hard. This leads to a denial of service, where your error tracking tool could become unresponsive, effectively halting your error monitoring and impacting your application’s reliability! Update Bugsink to version 2.0.6 or later immediately to mitigate this issue. Also, consider reviewing your DSN exposure in public setups like JavaScript and Mobile Apps to minimize risks. Secure your configurations! You've got this! Follow these steps to keep your error tracking tool running smoothly and securely. 🛡️

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00337 · 25.9th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2025-11-10T21:46Z
EPSS history
Timeline
  • 10 NOV 21:46Z
    Bugsink vulnerable to unauthenticated remote DoS via crafted Brotli input (via CPU)
    cvelistv5