CVE-2025-26042 – Uptime Kuma Regular Expression Denial of Service Vulnerability

The following table lists the changes that have been made to the
CVE-2025-26042 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    Mar. 17, 2025

    Action Type Old Value New Value
    Added Description Uptime Kuma >== 1.23.0 has a ReDoS vulnerability, specifically when an administrator creates a notification through the web service. If a string is provided it triggers catastrophic backtracking in the regular expression, leading to a ReDoS attack.
    Added Reference https://github.com/louislam/uptime-kuma/issues/5574
    Added Reference https://github.com/louislam/uptime-kuma/pull/5573
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