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TI-2026-03946 Aliases CVE-2026-4541GHSA-g37f-4r6m-qg8m

janmojzis tinyssh Ed25519 Signature crypto_sign_ed25519_tinyssh.c signature verification

Priority MEDIUM 44CWE-345Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
Security bypass
Confidentiality · integrity · availability
None · Low · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-345.

Summary

A flaw has been found in janmojzis tinyssh up to 20250501. Impacted is an unknown function of the file tinyssh/crypto_sign_ed25519_tinyssh.c of the component Ed25519 Signature Handler. This manipulation causes improper verification of cryptographic signature. The attack is restricted to local execution. The attack's complexity is rated as high. The exploitability is considered difficult. The exploit has been published and may be used. Upgrading to version 20260301 is recommended to address this issue. Patch name: 9c87269607e0d7d20174df742accc49c042cff17. Upgrading the affected component is recommended.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00084 0th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix Fixed tinyssh (janmojzis): 20260301

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
janmojzistinyssh2025050120260301Patch availableCNA
  • tinyssh Vendorjanmojzis Affected 20250501 Fixed in 20260301 Patch available CNA

Remediation

  • Fix · CNA tinyssh (janmojzis) Fixed in 20260301

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-4541
  2. 2026-10-03 Alias added: GHSA-g37f-4r6m-qg8m

References

Exploit 1

Patch 3

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences