Uptime Kuma >== 1.23.0 has a ReDoS vulnerability, specifically when an administrator…
Priority MEDIUM 60CWE-1333Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- Required
- Attack complexity
- High
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- Low · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-1333.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00397 34th percentileScored 2026-11-07
Fix Fixed uptime-kuma (npm): 2.0.0-beta.2
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | uptime-kuma (npm) | 1.15.0 – 1.23.16 | — | No fix listed | GHSA-hx7h-9vf7-5xhg |
| — | uptime-kuma (npm) | 2.0.0-beta.0 to before 2.0.0-beta.2 | 2.0.0-beta.2 | Patch available | GHSA-hx7h-9vf7-5xhg |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- uptime-kuma (npm) Vendor— Affected 1.15.0 – 1.23.16 Fixed in — No fix listed GHSA-hx7h-9vf7-5xhg
- uptime-kuma (npm) Vendor— Affected 2.0.0-beta.0 to before 2.0.0-beta.2 Fixed in 2.0.0-beta.2 Patch available GHSA-hx7h-9vf7-5xhg
Remediation
- Fix · GHSA-hx7h-9vf7-5xhg uptime-kuma (npm) Fixed in 2.0.0-beta.2 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-26042
- 2026-10-03 Alias added: GHSA-hx7h-9vf7-5xhg
References
Other 7
- https://github.com/louislam/uptime-kuma/issues/5574
- https://github.com/louislam/uptime-kuma/pull/5573
- https://github.com/louislam/uptime-kuma/commit/7a9191761dbef6551c2a0aa6eed5f693ba48d688
- https://github.com/louislam/uptime-kuma/security/advisories/GHSA-hx7h-9vf7-5xhg
- https://gist.github.com/ShiyuBanzhou/26c918f93b07f5ce90e8f7000d29c7a0
- https://gist.github.com/ShiyuBanzhou/bf4cee61603e152c114fa8c4791f9f28
- https://github.com/louislam/uptime-kuma
Sources
- CVE-2025-26042 · CVE Program
- CVE-2025-26042 · NVD
- FIRST EPSS
- GHSA-hx7h-9vf7-5xhg · GitHub Advisory Database · CC BY 4.0
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