HIGH7.5

PYSEC-2026-1227

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

Quick fix

PYSEC-2026-1227 — bugsink: upgrade to the fixed version with the command below.

pip install --upgrade 'bugsink>=2.0.6'

Details

### Impact

In affected versions, 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).

### Patches

Patched in Bugsink 2.0.6

### References

The vulnerability in this security advisory is similar to, but distinct from, another brotli-related problem in Bugsink:

https://github.com/bugsink/bugsink/security/advisories/GHSA-fc2v-vcwj-269v

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/bugsink

Introduced in: 0Fixed in: 2.0.6

Fixpip install --upgrade 'bugsink>=2.0.6'

References

https://github.com/bugsink/bugsink/security/advisories/GHSA-rrx3-2x4g-mq2h[WEB]
https://nvd.nist.gov/vuln/detail/CVE-2025-64509[ADVISORY]
https://github.com/bugsink/bugsink/commit/1201f754e39265d2aac58edf49dc380bac334388[WEB]
https://github.com/bugsink/bugsink[PACKAGE]
https://pypi.org/project/bugsink[PACKAGE]
https://github.com/advisories/GHSA-rrx3-2x4g-mq2h[ADVISORY]