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.

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 maliciou…

EPSS: 0.000 (1.6th percentile) — read the EPSS interpretation.

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.

Affected products

Succinct Sp1
Succinctlabs Sp1 — versions >= 6.0.0, < 6.1.0

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, 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.