# CVE-2026-40323

> Vulnerability · severity: **HIGH** (CVSS 7.5).

## Description

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.

## Key facts

- **CVE ID:** CVE-2026-40323
- **Published:** 2026-04-18
- **CVSS severity:** HIGH
- **CVSS base score:** 7.5
- **CWE codes:** CWE-345, CWE-354

## Affected products

- `succinct:sp1`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40323

## Citation

> AI Analytics. CVE-2026-40323. Retrieved 2026-07-05 from https://api.ai-analytics.org/cve/CVE-2026-40323. Derived from NIST NVD. Licensed CC0.

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