CVE-2023-33953: PYSEC-2026-1424 - Excessive Iteration in gRPC

CVE-2023-33953 · Severity: low · CVSS 3.1 · Published 2026-07-07

Excessive Iteration in gRPC

Technologies: grpcio (PyPI), grpc (RubyGems). Vendors: PyPI, RubyGems.

Quick answers

Is CVE-2023-33953 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2023-33953 being exploited in the wild.
How severe is CVE-2023-33953?
Low severity, with a CVSS score of 3.1, published 7 July 2026.
Which products and versions are affected?
grpcio (PyPI) ECOSYSTEM:introduced=0,fixed=1.53.2, ECOSYSTEM:introduced=0,fixed=1.53.2,introduced=1.54.0,fixed=1.54.3,introduced=1.55.0,fixed=1.55.2,introduced=1.56.0,fixed=1.56.2; grpc (RubyGems) ECOSYSTEM:introduced=0,fixed=1.53.2.
Is there a fix for CVE-2023-33953?
Yes. grpcio (PyPI): upgrade to 1.53.2, 1.56.2 or later; grpc (RubyGems): upgrade to 1.53.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2023-33953?
Check whether you run grpcio (PyPI) or grpc (RubyGems) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • grpcio (PyPI): upgrade to 1.53.2, 1.56.2 or later
    pip install "grpcio>=1.56.2"
  • grpc (RubyGems): upgrade to 1.53.2 or later
    bundle update grpc

Affected products

  • grpcio (PyPI) ECOSYSTEM:introduced=0,fixed=1.53.2, ECOSYSTEM:introduced=0,fixed=1.53.2,introduced=1.54.0,fixed=1.54.3,introduced=1.55.0,fixed=1.55.2,introduced=1.56.0,fixed=1.56.2
  • grpc (RubyGems) ECOSYSTEM:introduced=0,fixed=1.53.2

Identifiers

  • CVE-2023-33953
  • GHSA-496j-2rq6-j6cc
  • PYSEC-2026-1424

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