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CVE

CVE-2026-40323

SP1 is a zero‑knowledge virtual machine that proves the correct execution of programs compiled for the RISC-V architec

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.

HIGH · CVSS 7.5 EPSS 0.00011
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-345Insufficient Verification of Data Authenticity
CWE-354Improper Validation of Integrity Check Value
▤

Affected Products & Versions

1
succinct sp1>= 6.0.0 and < 6.1.0
▤

Affected Packages

3
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
crates.io sp1_prover HIGH fixed in 6.1.0
crates.io sp1_recursion_circuit HIGH fixed in 6.1.0
crates.io sp1_sdk HIGH fixed in 6.1.0
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD18 Apr 2026 · 12:16 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/succinctlabs/sp1/releases/tag/v6.1.0Release Notes
https://github.com/succinctlabs/sp1/security/advisories/GHSA-63x8-x938-vx33Vendor Advisory
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