Bugsink is vulnerable to unauthenticated remote DoS via crafted Brotli input
Impact
In affected versions, 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).
Patches
Patched in Bugsink 2.0.5
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | bugsink | < 2.0.5 | 2.0.5 |
References
- https://github.com/bugsink/bugsink/security/advisories/GHSA-fc2v-vcwj-269v
- https://nvd.nist.gov/vuln/detail/CVE-2025-64508
- https://github.com/google/brotli/issues/1327
- https://github.com/google/brotli/issues/1375
- https://github.com/bugsink/bugsink/pull/266
- https://github.com/google/brotli/pull/1234
- https://github.com/bugsink/bugsink/commit/3f65544aab3ad5303d97009136640de97b0676a5
- https://github.com/google/brotli/commit/67d78bc41db1a0d03f2e763497748f2f69946627
- https://github.com/bugsink/bugsink
- https://github.com/google/brotli/releases/tag/v1.2.0
- https://pypi.org/project/bugsink
- https://github.com/advisories/GHSA-fc2v-vcwj-269v
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-770- Platform
- Python (PyPI)
- Package
bugsink- Disclosed
- 13.11.2025
- Updated
- 11.10.2026 13:19
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-1225 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-fc2v-vcwj-269v - CC BY 4.0
Vulnerability history: bugsink
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 10
- First → latest
- 07.2025 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 4
- Medium 3
- Low 2
Disclosures per year
- 2025: 3
- 2026: 7
-
Bugsink is vulnerable to unauthenticated remote DoS via crafted Brotli input this entry
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