CVE-2026-3706: fallo de gravedad media en mkj Dropbear
mkj Dropbear S Range Check curve25519.c unpackneg signature verification
Publicada el · Actualizada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
13Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 6.3epss 0.2%
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."
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:U
Productos afectados
mkj · DropbearReferencias
https://github.com/mkj/dropbear/https://github.com/mkj/dropbear/commit/fdec3c90a15447bd538641d85e5a3e3ac981011dhttps://github.com/mkj/dropbear/issues/406https://github.com/mkj/dropbear/pull/407https://github.com/str4d/ed25519-java/issues/82#issue-727629226https://vuldb.com/?ctiid.349652https://vuldb.com/?id.349652https://vuldb.com/?submit.765933