High severity7.5OSV Advisory· Published Nov 10, 2025· Updated Apr 15, 2026

CVE-2025-64509

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
bugsinkPyPI	< 2.0.6	2.0.6

Affected products

Bugsink/BugsinkOSV
Range: 0.1.0, 0.1.1, 0.1.10, …
ghsa-coords
pkg:pypi/bugsink
Range: < 2.0.6

Patches

Vulnerability mechanics

References

github.com/advisories/GHSA-rrx3-2x4g-mq2hghsaADVISORY
nvd.nist.gov/vuln/detail/CVE-2025-64509ghsaADVISORY
github.com/bugsink/bugsink/commit/1201f754e39265d2aac58edf49dc380bac334388ghsaWEB
github.com/bugsink/bugsink/security/advisories/GHSA-rrx3-2x4g-mq2hnvdWEB

News mentions

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cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000