Quick answers
- Is CVE-2026-55163 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-55163 being exploited in the wild.
- How severe is CVE-2026-55163?
- Medium severity, with a CVSS score of 6.3, published 18 August 2026.
- Which products and versions are affected?
- lemur (PyPI) <= 1.9.1, ECOSYSTEM:introduced=0,fixed=1.9.2.
- Is there a fix for CVE-2026-55163?
- Yes. lemur (PyPI): upgrade to 1.9.2 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-55163 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-55163?
- Check whether you run lemur (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
- lemur (PyPI): upgrade to 1.9.2 or later
pip install "lemur>=1.9.2"
Technical details
An incorrect authorization check in 'lemur/roles/views.py' allows any member of a role to perform updates on that role. The 'PUT' handler uses 'RoleMemberPermission', which incorrectly grants access if the user is either an administrator or a member of the target role, whereas the 'DELETE' handler correctly requires administrative privileges. An authenticated attacker with low privileges can add or remove users from roles they already belong to, potentially gaining lateral access to certificate authorities or certificate management functions. The vulnerability is addressed in version 1.9.2 by enforcing administrative requirements on the affected endpoint.
Affected products
- Netflix Lemur <= 1.9.1
Identifiers
- CVE-2026-55163
- GHSA-x3vf-mgxj-7785
- PYSEC-2026-2591
Timeline
- 2026-06-10: disclosed: Initial disclosure to Netflix/lemur
- 2026-06-25: advisory: GitHub Advisory published
- 2026-06-25: patched: Version 1.9.2 released