CVE-2025-26042
First published: Mon Mar 17 2025(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Uptime Kuma | >1.23.0 | |
| npm/uptime-kuma | >=1.23.0<=2.0.0-dev.0 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2025-26042?
CVE-2025-26042 is classified as a medium severity vulnerability due to its potential for triggering denial of service through ReDoS attacks.
How do I fix CVE-2025-26042?
To mitigate CVE-2025-26042, update Uptime Kuma to version 2.0.0 or later, which addresses the vulnerability.
What causes CVE-2025-26042?
CVE-2025-26042 is caused by catastrophic backtracking in a regular expression when handling certain string inputs for notifications.
Who is affected by CVE-2025-26042?
CVE-2025-26042 affects users of Uptime Kuma version 1.23.0 and later up to 2.0.0-dev.0.
Is CVE-2025-26042 a client-side or server-side vulnerability?
CVE-2025-26042 is a server-side vulnerability as it exploits the processing of input on the web service by administrators.
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