Apache Tomcat Coyote vulnerable to Denial of Service via excessive HTTP/2 streams
Published Jul 10, 2025 · Updated Oct 23, 2026 · Also known as GHSA-25xr-qj8w-c4vf, BIT-tomcat-2025-53506
Original summary
Normalized public record · Updated Oct 23, 2026
Apache Tomcat Coyote vulnerable to Denial of Service via excessive HTTP/2 streams
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams.
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
- MEDIUM
- Confidence
- 10%
- Aliases
- GHSA-25xr-qj8w-c4vf, BIT-tomcat-2025-53506
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
Record history
Published Jul 10, 2025 · Last refreshed Oct 23, 2026