# CVE-2017-8359: PYSEC-2017-101 - Google gRPC before 2017-03-29 has an out-of-bounds write caused by a heap-based use-after-free…

Source: https://junglewise.ai/threats/cve-2017-8359-pysec-2017-101-google-grpc-before-2017-03-29-has-an-out-of-bounds  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2017-04-30  
License: CC BY 4.0 with a link back

CVE-2017-8359 · Severity: info · Published 2017-04-30

Google gRPC before 2017-03-29 has an out-of-bounds write caused by a heap-based use-after-free related to the grpc_call_destroy function in core/lib/surface/call.c.

Technologies: [grpcio (PyPI)](https://junglewise.ai/threats/technologies/grpcio). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2017-8359 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2017-8359 being exploited in the wild.

**How severe is CVE-2017-8359?** Informational severity, published 30 April 2017.

**Which products and versions are affected?** grpcio (PyPI) GIT:introduced=0,fixed=6544a2d5d9ecdb64214da1d228886a7d15bbf5c7|ECOSYSTEM:introduced=0,fixed=1.3.0.

**Is there a fix for CVE-2017-8359?** Yes. grpcio (PyPI): upgrade to 1.3.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2017-8359?** Check whether you run grpcio (PyPI) 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 1.3.0 or later

  ```sh
  pip install "grpcio>=1.3.0"
  ```


## Affected products

- grpcio (PyPI) GIT:introduced=0,fixed=6544a2d5d9ecdb64214da1d228886a7d15bbf5c7|ECOSYSTEM:introduced=0,fixed=1.3.0

## Identifiers

- CVE-2017-8359
- PYSEC-2017-101

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- [PYSEC-2026-1425 - gRPC Reachable Assertion issue](https://junglewise.ai/threats/cve-2023-1428-grpc-reachable-assertion-issue)
- [PYSEC-2026-1427 - Connection confusion in gRPC](https://junglewise.ai/threats/cve-2023-32731-connection-confusion-in-grpc)