CVE-2025-64508

HIGH

Bugsink < 2.0.5 - Denial of Service via Brotli Decompression Bomb

Title source: llm
STIX 2.1

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.

Scores

CVSS v3 7.5
EPSS 0.0021
EPSS Percentile 43.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-770
Status published
Products (2)
bugsink/bugsink < 2.0.5
pypi/bugsink 0 - 2.0.5PyPI
Published Nov 10, 2025
Tracked Since Feb 18, 2026