CVE-2023-1428: gRPC Reachable Assertion issue

July 6, 2023 (updated August 13, 2025)

There exists an vulnerability causing an abort() to be called in gRPC. The following headers cause gRPC’s C++ implementation to abort() when called via http2:

te: x (x != trailers)

:scheme: x (x != http, https)

grpclb_client_stats: x (x == anything)

On top of sending one of those headers, a later header must be sent that gets the total header size past 8KB. We recommend upgrading past git commit 2485fa94bd8a723e5c977d55a3ce10b301b437f8 or v1.53 and above.

References

github.com/advisories/GHSA-6628-q6j9-w8vg
github.com/grpc/grpc/commit/2485fa94bd8a723e5c977d55a3ce10b301b437f8
github.com/grpc/grpc/issues/33463
github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-1428.yml
nvd.nist.gov/vuln/detail/CVE-2023-1428

Code Behaviors & Features

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