CVE-2019-11842: PYSEC-2026-2620 - matrix-sydent and matrix-synapse Use Cryptographically Weak PRNG

CVE-2019-11842 · Severity: low · CVSS 3 · Published 2026-07-09

matrix-sydent and matrix-synapse Use Cryptographically Weak PRNG

Technologies: matrix-sydent (PyPI), matrix-synapse (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2019-11842 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2019-11842 being exploited in the wild.
How severe is CVE-2019-11842?
Low severity, with a CVSS score of 3, published 9 July 2026.
Which products and versions are affected?
matrix-sydent (PyPI) ECOSYSTEM:introduced=0,fixed=1.0.3; matrix-synapse (PyPI) ECOSYSTEM:introduced=0,fixed=0.99.3.1.
Is there a fix for CVE-2019-11842?
Yes. matrix-sydent (PyPI): upgrade to 1.0.3 or later; matrix-synapse (PyPI): upgrade to 0.99.3.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2019-11842?
Check whether you run matrix-sydent (PyPI) or matrix-synapse (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

  • matrix-sydent (PyPI): upgrade to 1.0.3 or later
    pip install "matrix-sydent>=1.0.3"
  • matrix-synapse (PyPI): upgrade to 0.99.3.1 or later
    pip install "matrix-synapse>=0.99.3.1"

Affected products

  • matrix-sydent (PyPI) ECOSYSTEM:introduced=0,fixed=1.0.3
  • matrix-synapse (PyPI) ECOSYSTEM:introduced=0,fixed=0.99.3.1

Identifiers

  • CVE-2019-11842
  • GHSA-gwf7-vfjf-wf6x
  • PYSEC-2019-185
  • PYSEC-2026-2620

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