RCE in Ntfy
CVE-2026-39087
ntfy before 2.22.0 allows SSRF because of an unanchored regular expression for web push endpoint URLs.
EPSS: 0.003 (19.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
Affected products
- Ntfy — versions 0
- N/a — versions n/a
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-39087?
- CVE-2026-39087 is a medium-severity vulnerability in Ntfy, classified under CWE-777. CVSS score: 6.4/10. Published 2026-04-23.
- How severe is CVE-2026-39087?
- Medium severity. CVSS v3 base score is 6.4 out of 10.