Vulnerability · Published Apr 23, 2026 · Assigned by mitre
CVE-2026-39087
Medium 6.4
In plain English
A medium-severity code injection in ntfy from ntfy. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.4Medium
Exploit odds (30 days)0.3%top 80.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
ntfy before 2.22.0 allows SSRF because of an unanchored regular expression for web push endpoint URLs.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | heckel.io/ntfy | no fix listed | GO-2026-5551 |
| Go | heckel.io/ntfy/v2 | 2.22.0 | GHSA-pqhx-w72w-m393 |
| Go | heckel.io/ntfy/v2 | 2.22.0 | GO-2026-5551 |
| Ubuntu:25.10 | ntfy | no fix listed | UBUNTU-CVE-2026-39087 |
| Ubuntu:26.10 | ntfy | no fix listed | UBUNTU-CVE-2026-39087 |
Affected products (as reported)
Weakness: CWE-777, CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N