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Advisory record · GHSA-g2p6-hh5v-7hfm

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

CVSS 8.7 HighEPSS 0.0023 · 14th percentile

Published by the GitHub Advisory Database at 13 Mar 2026, 15:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
soroban-poseidoncrates.io<25.0.125.0.1
Identifiers
GHSA-g2p6-hh5v-7hfm · CVE-2026-32129
Weakness (CWE)
CWE-328
Tags
Published
13 Mar 2026
Updated
13 Mar 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Poseidon V1 (PoseidonSponge) in the soroban-poseidon crate, versions before 25.0.1, accepts variable-length inputs without injective padding, so hashing fewer inputs than the sponge rate zero-fills the remaining positions and lets different input vectors produce the same hash. An attacker who can supply such inputs can craft collisions, such as a vector and the same vector with an appended zero. Upgrade to soroban-poseidon 25.0.1. Poseidon2 is not affected.

Written 8 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0023, the 14th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 15:19 UTC First seen by agentprime
  2. 31 Oct 2026, 15:19 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.