HIGH7.5

PYSEC-2026-1425

gRPC Reachable Assertion issue

Quick fix

PYSEC-2026-1425 — grpcio: upgrade to the fixed version with the command below.

pip install --upgrade 'grpcio>=1.53.0'

Details

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.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/grpcio

Introduced in: 1.51.0Fixed in: 1.53.0

Fixpip install --upgrade 'grpcio>=1.53.0'

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1428[ADVISORY]
https://github.com/grpc/grpc/issues/33463[WEB]
https://github.com/grpc/grpc/commit/2485fa94bd8a723e5c977d55a3ce10b301b437f8[WEB]
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/grpc/CVE-2023-1428.yml[WEB]
https://pypi.org/project/grpcio[PACKAGE]
https://github.com/advisories/GHSA-6628-q6j9-w8vg[ADVISORY]