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CVE-2026-39087 — Vulnerability in heckel.io/ntfy/v2 — CVE Details

CRITICAL

ntfy.sh allows a remote attacker to execute arbitrary code via the parseActions function

Published April 23, 2026Updated June 25, 2026Source: osv

Summary

An issue in Ntfy ntfy.sh before v.2.22.0 allows a remote attacker to execute arbitrary code via the parseActions function.

Advisory Timeline

  • First published April 23, 2026 (172 days ago).
  • Last revised June 25, 2026 — 63 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Go
Update heckel.io/ntfy/v2 to 2.22.0 or later
go get heckel.io/ntfy/v2@v2.22.0

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: go (1).

PackageEcosystemAffectedFixed In
heckel.io/ntfy/v2
go
All versions2.22.0

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 9.8 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-39087?
ntfy.sh allows a remote attacker to execute arbitrary code via the parseActions function This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 9.8/10).
How do I check if my project is affected by CVE-2026-39087?
CVE-2026-39087 affects heckel.io/ntfy/v2. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-39087 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
9.8

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-pqhx-w72w-m393
GO-2026-5551

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