CVE-2026-3706— dropbear 数据伪造问题漏洞

mkj Dropbear S Range Check curve25519.c unpackneg signature verification

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:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

密码学签名的验证不恰当

dropbear 数据伪造问题漏洞

dropbear是Matt Johnston个人开发者的一个应用程序。 dropbear 2025.89及之前版本存在数据伪造问题漏洞，该漏洞源于对组件S Range Check的文件src/curve25519.c中函数unpackneg的错误操作，可能导致加密签名验证不当。

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