CrowdSec LAPI: Denial of Service via Unbounded Gzip Decompression
Published Jul 16, 2026 · Updated Nov 3, 2026
Original summary
Normalized public record · Updated Nov 3, 2026
CrowdSec LAPI: Denial of Service via Unbounded Gzip Decompression
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
The LAPI router uses `gin-contrib/gzip` with `DefaultDecompressHandle` globally (`pkg/apiserver/controllers/controller.go`). This middleware decompresses incoming request bodies without enforcing a maximum decompressed size.
Potential impact
Exploiting this vulnerability will make LAPI unreachable, meaning that bouncers will not be able to fetch new decisions (but existing decisions will still be enforced) and log processors will not be able to send alerts, effectively denying the creation of new decisions.
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- LOW
- Confidence
- Not available
- Aliases
- None reported
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
Record history
Published Jul 16, 2026 · Last refreshed Nov 3, 2026