What is CVE-2025-64509?

CVE-2025-64509 is a high-severity vulnerability in Bugsink, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2025-11-10.

How severe is CVE-2025-64509?

High severity. CVSS v3 base score is 7.5 out of 10.

Resource exhaustion in Bugsink

CVE-2025-64509

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.

EPSS: 0.003 (22.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Bugsink — versions < 2.0.6

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2025-64509?: CVE-2025-64509 is a high-severity vulnerability in Bugsink, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2025-11-10.
How severe is CVE-2025-64509?: High severity. CVSS v3 base score is 7.5 out of 10.