CVE-2025-64508
HIGHBugsink < 2.0.5 - Denial of Service via Brotli Decompression Bomb
Title source: llmDescription
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.
References (8)
Core 8
Core References
Vendor Advisory x_refsource_confirm
https://github.com/bugsink/bugsink/security/advisories/GHSA-fc2v-vcwj-269v
Issue Tracking x_refsource_misc
https://github.com/google/brotli/issues/1327
Issue Tracking x_refsource_misc
https://github.com/google/brotli/issues/1375
Issue Tracking x_refsource_misc
https://github.com/bugsink/bugsink/pull/266
Issue Tracking x_refsource_misc
https://github.com/google/brotli/pull/1234
Patch x_refsource_misc
https://github.com/bugsink/bugsink/commit/3f65544aab3ad5303d97009136640de97b0676a5
Patch x_refsource_misc
https://github.com/google/brotli/commit/67d78bc41db1a0d03f2e763497748f2f69946627
Release Notes x_refsource_misc
https://github.com/google/brotli/releases/tag/v1.2.0
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