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.

CVSS v4.0

6.7 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:N/VA:H/SC:L/SI:L/SA:L

CVSS v3.1

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

EPSS

0.38% chance of exploitation in the next 30 days, 31th percentile

Published

2025-03-17

Updated

2026-01-26

Proof-of-concept exploits (1)

• advisories/GHSA-hx7h-9vf7-5xhg

References

• CVE Record
• NVD entry

Related

• CVE-2025-2604
• CVE-2025-26058
• CVE-2025-2603
• CVE-2025-2606
• CVE-2025-2602
• CVE-2025-26062