A vulnerability was determined in mkj Dropbear up to 2025.89. Impacted is the function unpackneg of the file src/curve25519.c of the component S Range Check. This manipulation causes improper verification of cryptographic signature. The attack can be initiated remotely. The attack is considered to have high complexity. The exploitability is considered difficult. The exploit has been publicly disclosed and may be utilized. Patch name: fdec3c90a15447bd538641d85e5a3e3ac981011d. To fix this issue, it is recommended to deploy a patch.

Metrics

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction None

Access Vector Network

Access Complexity High

Authentication None

Confidentiality Impact None

Integrity Impact Partial

Availability Impact None

AV:N/AC:H/Au:N/C:N/I:P/A:N/E:POC/RL:OF/RC:C

This CVE is not in the KEV list.

Exploitation poc

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Mkj
  • Dropbear

No data.

No data.

References
Link Providers
https://github.com/mkj/dropbear/ cve-icon cve-icon
https://github.com/mkj/dropbear/commit/fdec3c90a15447bd538641d85e5a3e3ac981011d cve-icon cve-icon
https://github.com/mkj/dropbear/issues/406#issue-3978907798 cve-icon cve-icon
https://github.com/mkj/dropbear/pull/407 cve-icon cve-icon
https://github.com/str4d/ed25519-java/issues/82#issue-727629226 cve-icon cve-icon
https://vuldb.com/?ctiid.349652 cve-icon cve-icon
https://vuldb.com/?id.349652 cve-icon cve-icon
https://vuldb.com/?submit.765933 cve-icon cve-icon
History

Tue, 10 Mar 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 09 Mar 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Mkj
Mkj dropbear
Vendors & Products Mkj
Mkj dropbear

Sun, 08 Mar 2026 05:15:00 +0000

Type Values Removed Values Added
Description A vulnerability was determined in mkj Dropbear up to 2025.89. Impacted is the function unpackneg of the file src/curve25519.c of the component S Range Check. This manipulation causes improper verification of cryptographic signature. The attack can be initiated remotely. The attack is considered to have high complexity. The exploitability is considered difficult. The exploit has been publicly disclosed and may be utilized. Patch name: fdec3c90a15447bd538641d85e5a3e3ac981011d. To fix this issue, it is recommended to deploy a patch.
Title mkj Dropbear S Range Check curve25519.c unpackneg signature verification
Weaknesses CWE-345
CWE-347
References
Metrics cvssV2_0

{'score': 2.6, 'vector': 'AV:N/AC:H/Au:N/C:N/I:P/A:N/E:POC/RL:OF/RC:C'}

cvssV3_0

{'score': 3.7, 'vector': 'CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C'}

cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C'}

cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published: 2026-03-08T05:02:11.136Z

Updated: 2026-03-10T14:06:36.950Z

Reserved: 2026-03-07T09:05:33.842Z

Link: CVE-2026-3706

cve-icon Vulnrichment

Updated: 2026-03-10T14:06:32.527Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-08T05:16:31.847

Modified: 2026-03-09T13:35:07.393

Link: CVE-2026-3706

cve-icon Redhat

No data.