CVE-2026-32129— soroban-poseidon 安全漏洞

Poseidon V1 variable-length input collision via implicit zero-padding

soroban-poseidon provides Poseidon and Poseidon2 cryptographic hash functions for Soroban smart contracts. Poseidon V1 (PoseidonSponge) accepts variable-length inputs without injective padding. When a caller provides fewer inputs than the sponge rate (inputs.len() < T - 1), unused rate positions are implicitly zero-filled. This allows trivial hash collisions: for any input vector [m1, ..., mk] hashed with a sponge of rate > k, hash([m1, ..., mk]) equals hash([m1, ..., mk, 0]) because both produce identical pre-permutation states. This affects any use of PoseidonSponge or poseidon_hash where the number of inputs is less than T - 1 (e.g., hashing 1 input with T=3). Poseidon2 (Poseidon2Sponge) is not affected.

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可逆的单向哈希

soroban-poseidon 安全漏洞

soroban-poseidon是Stellar开源的一个用于智能合约的Poseidon哈希函数库。 soroban-poseidon存在安全漏洞，该漏洞源于Poseidon V1接受可变长度输入而未使用单射填充，可能导致简单的哈希冲突。

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