gRPC-Go HTTP/2 Rapid Reset vulnerability
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Fixed
No CVSS vector from any source. Fix status from GitHub.
Summary
### Impact In affected releases of gRPC-Go, it is possible for an attacker to send HTTP/2 requests, cancel them, and send subsequent requests, which is valid by the HTTP/2 protocol, but would cause the gRPC-Go server to launch more concurrent method handlers than the configured maximum stream limit. ### Patches This vulnerability was addressed by #6703 and has been included in patch releases: 1.56.3, 1.57.1, 1.58.3. It is also included in the latest release, 1.59.0. Along with applying the patch, users should also ensure they are using the `grpc.MaxConcurrentStreams` server option to apply a limit to the server's resources used for any single connection. ### Workarounds None. ### References #6703
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | google.golang.org/grpc (Go) | before 1.56.3 | 1.56.3 | Patch available | GHSA-m425-mq94-257g |
| — | google.golang.org/grpc (Go) | 1.57.0 to before 1.57.1 | 1.57.1 | Patch available | GHSA-m425-mq94-257g |
| — | google.golang.org/grpc (Go) | 1.58.0 to before 1.58.3 | 1.58.3 | Patch available | GHSA-m425-mq94-257g |
- google.golang.org/grpc (Go) Vendor— Affected before 1.56.3 Fixed in 1.56.3 Patch available GHSA-m425-mq94-257g
- google.golang.org/grpc (Go) Vendor— Affected 1.57.0 to before 1.57.1 Fixed in 1.57.1 Patch available GHSA-m425-mq94-257g
- google.golang.org/grpc (Go) Vendor— Affected 1.58.0 to before 1.58.3 Fixed in 1.58.3 Patch available GHSA-m425-mq94-257g
Remediation
- Fix · GHSA-m425-mq94-257g google.golang.org/grpc (Go) Fixed in 1.56.3 Advisory →
- Fix · GHSA-m425-mq94-257g google.golang.org/grpc (Go) Fixed in 1.57.1 Advisory →
- Fix · GHSA-m425-mq94-257g google.golang.org/grpc (Go) Fixed in 1.58.3 Advisory →
Timeline
- 2026-10-03 Threatist record created from GHSA-m425-mq94-257g
References
Sources
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