CVE-2026-40323 HIGH

CVE-2026-40323: SP1 V6 Recursion Circuit Row-Count Binding Gap

Vendor Succinctlabs
Product sp1
Weakness CWE-345
Published April 17, 2026
Last update April 20, 2026

CVSS base score

8.9/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:N

What the vulnerability does

01Description

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 dates

02Disclosure timeline

April 17, 2026 CVE published
April 20, 2026 Record updated