CVE-2025-64509
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedBugsink 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceBugsink versions prior to 2.0.6 are vulnerable to a denial of service attack where a specially crafted Brotli-compressed envelope causes excessive CPU consumption during decompression. The attack requires knowledge of the DSN, which is often exposed in JavaScript and mobile app configurations.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify Bugsink installationLocate the Bugsink installation and determine its version number, typically found in package.json, requirements.txt, setup.py, or by querying the running instance for its version endpointAffected if The installed version is missing, cannot be determined, or is below 2.0.6
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Compare version to vulnerable rangeCompare the identified version against 2.0.6. If you obtained the version from package files or running software, ensure the comparison accounts for semantic versioning rulesAffected if The installed version is any version prior to 2.0.6 (e.g., 2.0.5, 2.0.0, 1.x.x)
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Check for DSN exposure in web assetsSearch JavaScript files, HTML templates, and client-side configuration for strings resembling DSN format (typically connection strings with protocol, credentials, and host)Affected if A valid DSN for the Bugsink instance is present in publicly accessible client-side code
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Check for DSN exposure in mobile configurationsInspect mobile app configuration files, bundled assets, or API endpoints that may contain the Bugsink DSNAffected if A valid DSN for the Bugsink instance is embedded in mobile application code or configuration
The environment is affected if Bugsink version is below 2.0.6 AND the DSN is exposed or discoverable, allowing an attacker to send malicious Brotli-compressed envelopes to trigger CPU exhaustion.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scopedUpgrade Bugsink to version 2.0.6 or later. Additionally, review and rotate any exposed DSNs to prevent future exploitation.
2.0.6
- Upgrade Bugsink to version 2.0.6 or later
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation1.0 h
- Implementation2.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $1,664.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-64509 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-64509 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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