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CVE-2026-3706

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CVE-2026-3706

Published: Mar 8, 2026

Modified: Apr 22, 2026

PUBLISHED

CVSS v3.1

3.7

LOW

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 actual existence of this vulnerability is currently in question. Patch name: fdec3c90a15447bd538641d85e5a3e3ac981011d. To fix this issue, it is recommended to deploy a patch. The project maintainer explains: "Signature Malleability is not exploitable in SSH protocol. (...) [A] PoC doesn't exist for SSH implementation, but rather it's against the internal API."

VendorProductVersions

mkj

Dropbear

affected
2025.0
affected
2025.1
affected
2025.2
affected
2025.3
affected
2025.4

+85 more versions

Weaknesses (CWE)

CWE-347
CWE-345

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

References

VDB-349652 | CTI Indicators (IOB, IOC, IOA)
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