CVE-2025-64509 - CVE House
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Status published High CVE-2025-64509

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

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from bugsink

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CVE-2025-64508
Bugsink vulnerable to unauthenticated remote DoS via crafted Brotli input
High 7.5
CVE-2025-54433
Bugsink is vulnerable to Path Traversal attacks via event_id in ingestion
High 7.2

Affected Vendor

Affected Software

bugsink
Vulnerable Versions:
< 2.0.6

Timeline

Official Publish: November 10th, 2025
Last Modified: November 12th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

CWE-770

MITRE ATT&CK TTPs

T1499 Endpoint Denial of Service
Impact
T1498 Network Denial of Service
Impact
T1190 Exploit Public-Facing Application
Initial Access
T1562 Impair Defenses
Defense Evasion
T1046 Network Service Discovery
Discovery