CVE-2019-9710: Webargs mishandles concurrent JSON parsing

CVE-2019-9710 · Severity: low · CVSS 3 · Published 2019-03-12

An issue was discovered in webargs before 5.1.3, as used with marshmallow and other products. JSON parsing uses a short-lived cache to store the parsed JSON body. This cache is not thread-safe, meaning that incorrect JSON payloads could have been parsed for concurrent requests.

Technologies: webargs (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2019-9710 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2019-9710 being exploited in the wild.
How severe is CVE-2019-9710?
Low severity, with a CVSS score of 3, published 12 March 2019.
Which products and versions are affected?
webargs (PyPI) ECOSYSTEM:introduced=0,fixed=5.1.3.
Is there a fix for CVE-2019-9710?
Yes. webargs (PyPI): upgrade to 5.1.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2019-9710?
Check whether you run webargs (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

  • webargs (PyPI): upgrade to 5.1.3 or later
    pip install "webargs>=5.1.3"

Affected products

  • webargs (PyPI) ECOSYSTEM:introduced=0,fixed=5.1.3

Identifiers

  • CVE-2019-9710
  • GHSA-8554-jxcw-454q
  • PYSEC-2019-139

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