How severe is CVE-2024-43366?

CVE-2024-43366 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-2024-43366 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-43366?

CVE-2024-43366 affects Matter-labs Zkvyper. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-43366?

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-2024-43366 have an EU (EUVD) identifier?

Yes. CVE-2024-43366 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-40254.

When was CVE-2024-43366 published?

CVE-2024-43366 was published on 2024-08-15 and last updated on 2026-06-17.

CVE-2024-43366

CVE-2024-43366 is a high-severity vulnerability in Matter-labs Zkvyper 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-835.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-40254
Weakness: CWE-835
Affected product: Matter-labs Zkvyper
Published: 2024-08-15
Last modified: 2026-06-17

Description

zkvyper is a Vyper compiler. Starting in version 1.3.12 and prior to version 1.5.3, since LLL IR has no Turing-incompletness restrictions, it is compiled to a loop with a much more late exit condition. It leads to a loss of funds or other unwanted behavior if the loop body contains it. However, more real-life use cases like iterating over an array are not affected. No contracts were affected by this issue, which was fixed in version 1.5.3. Upgrading and redeploying affected contracts is the only way to avoid the vulnerability.

Frequently asked questions

What is CVE-2024-43366?: zkvyper is a Vyper compiler. Starting in version 1.3.12 and prior to version 1.5.3, since LLL IR has no Turing-incompletness restrictions, it is compiled to a loop with a much more late exit condition. It leads to a loss of funds or other unwanted behavior if the loop body contains it. However, more real-life use cases like iterating over an array are not affected. No contracts were affected by this issue, which was fixed in version 1.5.3. Upgrading and redeploying affected contracts is the only way to avoid the vulnerability.
How severe is CVE-2024-43366?: CVE-2024-43366 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-2024-43366 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-43366?: CVE-2024-43366 affects Matter-labs Zkvyper. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-43366?: 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-2024-43366 have an EU (EUVD) identifier?: Yes. CVE-2024-43366 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-40254.
When was CVE-2024-43366 published?: CVE-2024-43366 was published on 2024-08-15 and last updated on 2026-06-17.

References

https://github.com/matter-labs/era-compiler-vyper/security/advisories/GHSA-8j77-7rrv-6pxx

Affected products (1)

cpe:2.3:a:matter-labs:zkvyper:*:*:*:*:*:*:*:*

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