CVE-2025-26042 json
Uptime Kuma's Regular Expression in pushdeeer and whapi file Leads to ReDoS Vulnerability Due to Catastrophic Backtracking
published last yr. modified 4mo ago also GHSA-hx7h-9vf7-5xhg , EUVD-2025-6495
- cvss
- 6.0
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 34%
- public exploits
- 0
- none known
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.
Patch / fix
- npm uptime-kuma 2.0.0-beta.2
- github.com/louislam/uptime-kuma@7a91917 commit
- github.com/louislam/uptime-kuma#5573 pull request
Is CVE-2025-26042 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- last yr.
Exploit prediction
0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 6.0 | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:H/A:H |
| CNA | 3.1 | 6.0 | CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | uptime-kuma | >=1.15.0, <=1.23.16 >=2.0.0-beta.0, <2.0.0-beta.2 |
2.0.0-beta.2 |
Classification
- Weakness
-
- CWE-1333 Inefficient Regular Expression Complexity
References
-
github.com
/louislam/uptime-kuma/pull/5573
web
-
github.com
/louislam/uptime-kuma/commit/7a9191761dbef6551c2a0aa6eed5f693ba48d688
web
-
github.com
/louislam/uptime-kuma/issues/5574
web
-
github.com
/louislam/uptime-kuma/security/advisories/GHSA-hx7h-9vf7-5xhg
web
-
nvd.nist.gov
/vuln/detail/CVE-2025-26042
advisory
-
gist.github.com
/ShiyuBanzhou/26c918f93b07f5ce90e8f7000d29c7a0
web
-
gist.github.com
/ShiyuBanzhou/bf4cee61603e152c114fa8c4791f9f28
web
-
github.com
/louislam/uptime-kuma
package
Sources
- CVE List CVE-2025-26042
- GitHub Advisory GHSA-hx7h-9vf7-5xhg
- NVD CVE-2025-26042
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