Vulnerability in Succinct Sp1
CVE-2026-40323
SP1 is a zero‑knowledge virtual machine that proves the correct execution of programs compiled for the RISC-V architecture. In versions 6.0.0 through 6.0.2, a soundness vulnerability in the SP1 V6 recursive shard verifier allows a malicious prover to construct a recursive proof from a shard proof that the native verifier would reject. Version 6.1.0 fixes the issue.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.002 (11.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 11.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Succinct Sp1
- Succinctlabs Sp1 — versions >= 6.0.0, < 6.1.0
Weakness classification (CWE)
References
- github.com/succinctlabs/sp1/security/advisories/GHSA-63x8-x938-vx33 (Vendor Advisory)
- github.com/succinctlabs/sp1/releases/tag/v6.1.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-40323?
- CVE-2026-40323 is a high-severity vulnerability in Succinct Sp1, classified under Insufficient Verification of Data Authenticity. CVSS score: 7.5/10. Published 2026-04-18.
- How severe is CVE-2026-40323?
- High severity. CVSS v3 base score is 7.5 out of 10.