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CVE-2025-64509

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

Published: Nov 10, 2025Updated: Nov 12, 2025 Sources: CVE List NVD GHSACWE-770
NVD MITRE
7.5CVSSHIGH
EPSS Score
0.3%
Top 81.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-770

Affected Products

bugsinkbugsink
On-prem
Enterprise Software / itsm-monitoring
bugsinkPyPIOSS Libraries
bugsinkoss-projectEnterprise Software
pypipackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Impact
View detailed technique mapping

References

https://github.com/bugsink/bugsink/security/advisories/GHSA-rrx3-2x4g-mq2h
github.com
https://nvd.nist.gov/vuln/detail/CVE-2025-64509
nvd.nist.gov
https://github.com/bugsink/bugsink/commit/1201f754e39265d2aac58edf49dc380bac334388
github.com
and 1 more references View all →

Timeline

Published
Nov 10, 2025
Last Updated
Nov 12, 2025

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