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CVE-2025-26042

MEDIUMCVSS 6/10EPSS 0.37%

Last modified

CVE-2025-26042 is a medium-severity vulnerability rated 6/10 on the CVSS scale. 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.. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
6/10

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:H/A:H

EPSS Probability
0.37%

28.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is CVE-2025-26042?
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.
How severe is CVE-2025-26042?
CVE-2025-26042 has a CVSS score of 6/10 (MEDIUM severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.
How do I fix CVE-2025-26042?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-26042?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST