dropbear: A vulnerability was determined in mkj Dropbear up to 2025.89
CVE-2026-3706 is fixed in dropbear on 1 platform by DEBIAN-CVE-2026-3706 (version 2026.90-1), released March 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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."
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dropbear · Debian 14 | 2026.90-1 | DEBIAN-CVE-2026-3706 | Mar 8, 2026 |
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