Resource exhaustion in Bugsink
CVE-2025-64508
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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (38.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Bugsink — versions < 2.0.5
Weakness classification (CWE)
References
- github.com/bugsink/bugsink/security/advisories/GHSA-fc2v-vcwj-269v
- github.com/google/brotli/issues/1327
- github.com/google/brotli/issues/1375
- github.com/bugsink/bugsink/pull/266
- github.com/google/brotli/pull/1234
- github.com/bugsink/bugsink/commit/3f65544aab3ad5303d97009136640de97b0676a5
- github.com/google/brotli/commit/67d78bc41db1a0d03f2e763497748f2f69946627
- github.com/google/brotli/releases/tag/v1.2.0
Frequently asked questions
- What is CVE-2025-64508?
- CVE-2025-64508 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-2025-64508?
- High severity. CVSS v3 base score is 7.5 out of 10.