CVE-2026-32129
Hash collision in PoseidonSponge for short input vectors.
Is CVE-2026-32129 being exploited?
Not confirmed. CVE-2026-32129 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.22% probability of exploitation in the next 30 days.
How severe is CVE-2026-32129?
CVE-2026-32129 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-32129?
Yes. A fix has been recorded for CVE-2026-32129. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-32129 affect?
CVE-2026-32129 affects Soroban PoseidonSponge, PoseidonHash, Soroban smart contracts. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-32129?
Upgrade to patched Poseidon library when released
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Enables hash collisions for short inputs, risking contract verification integrity in Soroban apps.
Patch when possible
- affected< 25.0.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.