CVE-2024-43366: zkvyper is a Vyper compiler

This week

HIGH 7.5REMOTEUPGRADE

CVE-2024-43366 is a high-severity flaw (CVSS 7.5) affecting zkvyper. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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. Upgrad

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-835
Published	2024-08-15
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: matter-labs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-08-15 21:15 UTCPublished CVE record published
2026-06-17 07:50 UTCUpdated Record last modified

matter-labs zkvyper UPGRADE

Affected: >= 1.3.12 and < 1.5.3

Fixed in: 1.5.3

Safe to downgrade to: a release before 1.3.12

1. Check installed version

apt-cache policy zkvyper || rpm -q zkvyper || zkvyper --version

2. UPGRADE to 1.5.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade zkvyper

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade zkvyper

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.3.12 (Debian / Ubuntu)

apt-cache madison zkvyper sudo apt install zkvyper=<VERSION_BEFORE_1.3.12> sudo apt-mark hold zkvyper

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list zkvyper sudo dnf downgrade zkvyper-<VERSION_BEFORE_1.3.12> sudo dnf versionlock add zkvyper

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-43366?

zkvyper: upgrade to 1.5.3. Exact commands for each OS are on this page.

Is CVE-2024-43366 being exploited?

CVE-2024-43366 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-43366 affect?

CVE-2024-43366 affects zkvyper. Severity is high (CVSS 7.5). 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 u

How urgent is CVE-2024-43366?

Priority 47/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-46232 MEDIUM 5.3 UPGRADE era-compiler-vyper is the EraVM Vyper compiler for zkSync Era, a layer 2 rollup that uses zero-knowledge proof

References

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