PT-2026-34669 · Ntfy.Sh · Ntfy.Sh

Mightynawaf · Published 2026-04-23 · Updated 2026-05-04 · CVE-2026-39087

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions ntfy.sh versions prior to 2.21

Description A remote attacker can execute arbitrary code through the parseActions() function.

Recommendations Update to version 2.21 or later. As a temporary workaround, consider restricting access to the parseActions() function until the update is applied.

Fix

RCE

Code Injection

Weakness Enumeration

CWE-94

Related Identifiers

CVE-2026-39087

GHSA-PQHX-W72W-M393

Affected Products

Ntfy.Sh

References · 12

• https://nvd.nist.gov/vuln/detail/CVE-2026-39087 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-39087 · Security Note
• https://osv.dev/vulnerability/GHSA-pqhx-w72w-m393 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-39087 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-39087 · Vendor Advisory
• https://github.com/binwiederhier/ntfy · Note
• https://github.com/binwiederhier/ntfy/releases/tag/v2.22.0 · Note
• http://ntfysh.com · Note
• https://t.me/cveNotify/161981 · Telegram Post
• http://ntfy.com · Note
• https://twitter.com/CCBalert/status/2047714512170611154 · Twitter Post
• https://gist.github.com/MightyNawaf/5d41d6e8ead16e217f86b016002ecae5 · Note