How severe is CVE-2026-40323?

CVE-2026-40323 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-40323 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40323?

CVE-2026-40323 affects Succinct Sp1. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40323?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-40323 have an EU (EUVD) identifier?

Yes. CVE-2026-40323 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24062.

When was CVE-2026-40323 published?

CVE-2026-40323 was published on 2026-04-18 and last updated on 2026-06-17.

CVE-2026-40323

CVE-2026-40323 is a high-severity vulnerability in Succinct Sp1 with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-345.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.9
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-24062
Weakness: CWE-345
Affected product: Succinct Sp1
Published: 2026-04-18
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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 malicious prover to construct a recursive proof from a shard proof that the native verifier would reject. Version 6.1.0 fixes the issue.
How severe is CVE-2026-40323?: CVE-2026-40323 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-40323 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40323?: CVE-2026-40323 affects Succinct Sp1. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40323?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-40323 have an EU (EUVD) identifier?: Yes. CVE-2026-40323 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24062.
When was CVE-2026-40323 published?: CVE-2026-40323 was published on 2026-04-18 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:succinct:sp1:*:*:*:*:*:*:*:*

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