Zero-Knowledge Virtual Machine Vulnerability in SP1 by Succinct Labs
CVE-2026-40323

8.9HIGH

Key Information:

Vendor

Succinctlabs

Status
Sp1
Vendor
CVE Published:
17 April 2026

What is CVE-2026-40323?

In SP1 versions 6.0.0 through 6.0.2, a soundness vulnerability exists within the V6 recursive shard verifier component. This issue permits a malicious actor to create a recursive proof derived from a shard proof that would typically be rejected by the native verifier. This exploit compromises the integrity of program execution for applications designed for the RISC-V architecture. The vulnerability has been addressed in version 6.1.0, making it crucial for users to update to this release to ensure protection against potential misuse.

Affected Version(s)

sp1 >= 6.0.0, < 6.1.0

References

https://github.com/succinctlabs/sp1/security/advisories/G...
x_refsource_CONFIRM
https://github.com/succinctlabs/sp1/releases/tag/v6.1.0
x_refsource_MISC

CVSS V4

Score:
8.9
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.