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Advisory record · GHSA-9hxf-ppjv-w6rq

gRPC connection termination issue

CVSS 5.3 MediumEPSS 0.0053 · 44th percentile

Published by the GitHub Advisory Database at 6 Jul 2023, 21:15 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.grpc:grpc-protobufMaven>=1.53.0, <1.53.1 || >=1.54.0, <1.54.21.53.1, 1.54.2
grpcioPyPI>=1.53.0, <1.53.1 || >=1.54.0, <1.54.21.53.1, 1.54.2
grpcRubyGems>=1.53.0, <1.53.1 || >=1.54.0, <1.54.21.53.1, 1.54.2
Identifiers
GHSA-9hxf-ppjv-w6rq · CVE-2023-32732 · PYSEC-2026-1426
Weakness (CWE)
CWE-440
Tags
Published
6 Jul 2023
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

grpc-protobuf (io.grpc), grpcio and grpc are affected in versions 1.53.0 before 1.53.1 and 1.54.0 before 1.54.2. A client can send a malformed base64 header with a -bin suffix, causing the gRPC server to drop its connection with an HTTP/2 proxy. Upgrade to 1.53.1 or 1.54.2.

Written 2 Nov 2026.

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

ScoreRatingCVSSVectorSource
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CNA (Google)
  • CISA KEV Not listed.
  • EPSS 0.0053, the 44th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:18 UTC First seen by agentprime
  2. 31 Oct 2026, 14:18 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.