Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The gRPC C++ implementation, as shipped in io.grpc:grpc-protobuf (Maven), grpcio (PyPI), and grpc (RubyGems) versions 1.51.0 up to but not including 1.53.0, can be made to call abort() when it receives certain HTTP/2 headers. An attacker who can send HTTP/2 requests to a gRPC server can crash it by sending one of these headers followed by a later header that pushes the total header size past 8KB. Upgrade to version 1.53.0 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA (Google) |
- CISA KEV Not listed.
- EPSS 0.0041, the 35th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:18 UTC First seen by agentprime
- 31 Oct 2026, 14:18 UTC Confirmed by OSV