CVE-2025-54363

Description

Microsoft Knack 0.12.0 allows Regular expression Denial of Service (ReDoS) in the knack.introspection module. extract_full_summary_from_signature employs an inefficient regular expression pattern: "\s(:param)\s+(.+?)\s:(.*)" that is susceptible to catastrophic backtracking when processing crafted docstrings containing a large volume of whitespace without a terminating colon. An attacker who can control or inject docstring content into affected applications can trigger excessive CPU consumption. This software is used by Azure CLI.

References

Link	Tags
https://github.com/microsoft/knack
https://www.vulncheck.com/advisories/microsoft-knack-python-package-regular-expression-dos
https://github.com/microsoft/knack/issues/281

Frequently Asked Questions

What is the severity of CVE-2025-54363?: CVE-2025-54363 has been scored as a medium severity vulnerability.
How to fix CVE-2025-54363?: To fix CVE-2025-54363, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-54363 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-54363 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-54363?: CVE-2025-54363 affects Microsoft Knack.

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Description

Category

CWE-1333 – Inefficient Regular Expression Complexity

References

Frequently Asked Questions