Improper Verification in Ed25519 Signature Handler of TinySSH by janmojzis
CVE-2026-4541

2LOW

Key Information:

Vendor

Janmojzis

Status
Tinyssh
Vendor
CVE Published:
22 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4541?

A vulnerability has been identified in the Ed25519 Signature Handler of tinyssh, which allows for improper verification of cryptographic signatures. This flaw impacts local execution and could enable an attacker to manipulate signatures, posing security risks. Difficulty in exploitation adds complexity, yet the issue has been published. It is recommended to upgrade to version 20260301 to mitigate this vulnerability effectively. For enhanced security, users should monitor updates and apply the latest patches promptly.

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Deploy the Patch

Affected Version(s)

tinyssh 20250501

tinyssh 20260301

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-4541 - Proof of Concept

References

https://vuldb.com/?id.352358
vdb-entry
https://vuldb.com/?ctiid.352358
signaturepermissions-required
https://vuldb.com/?submit.774687
third-party-advisory

CVSS V4

Score:
2
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Local
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

pythok (VulDB User)
JSON
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