CVE-2025-26042: Uptime Kuma ReDoS vulnerability

March 17, 2025 (updated March 20, 2025)

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.

References

github.com/advisories/GHSA-3rw8-4xrq-3f7p
github.com/louislam/uptime-kuma
github.com/louislam/uptime-kuma/commit/7a9191761dbef6551c2a0aa6eed5f693ba48d688
github.com/louislam/uptime-kuma/issues/5574
github.com/louislam/uptime-kuma/pull/5573
nvd.nist.gov/vuln/detail/CVE-2025-26042

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