Description
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.
INFO
Published Date :
2026-03-12T17:47:10.717Z
Last Modified :
2026-03-13T16:23:54.655Z
Source :
GitHub_M
AFFECTED PRODUCTS
The following products are affected by CVE-2026-32129 vulnerability.
| Vendors | Products |
|---|---|
| Stellar |
|
REFERENCES
Here, you will find a curated list of external links that provide in-depth information to CVE-2026-32129.
