What is CVE-2022-29219?

CVE-2022-29219 is a high-severity vulnerability in Chainsafe Lodestar, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2022-05-24.

How severe is CVE-2022-29219?

High severity. CVSS v3 base score is 7.5 out of 10.

Integer overflow in Chainsafe Lodestar

CVE-2022-29219

Lodestar is a TypeScript implementation of the Ethereum Consensus specification. Prior to version 0.36.0, there is a possible consensus split given maliciously-crafted `AttesterSlashing` or `ProposerSlashing` being included on-chain. Because the developers represent `uint64` values as native javascript `number`s, there is an issue when those variables with large (greater than 2^53) `uint64` values are included on chain. In those cases, Lodestar may view valid_`AttesterSlashing` or `ProposerSlashing` as invalid, due to rounding errors in large `number` values. This causes a consensus split, where Lodestar nodes are forked away from the main network. Similarly, Lodestar may consider invalid `ProposerSlashing` as valid, thus including in proposed blocks that will be considered invalid by the network. Version 0.36.0 contains a fix for this issue. As a workaround, use `BigInt` to represent `Slot` and `Epoch` values in `AttesterSlashing` and `ProposerSlashing` objects. `BigInt` is too slow to be used in all `Slot` and `Epoch` cases, so one may carefully use `BigInt` just where necessary for consensus.

Vulnerability class: Integer Overflow

Published 2022-05-24 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.013 (69.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: +0.000

Affected products

Chainsafe Lodestar — versions < 0.36.0

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

github.com/ChainSafe/lodestar/security/advisories/GHSA-cvj7-5f3c-9vg9 (Patch, Third Party Advisory)
github.com/ChainSafe/lodestar/pull/3977 (Patch, Third Party Advisory)
github.com/ChainSafe/lodestar/releases/tag/v0.36.0 (Third Party Advisory, Release Notes)

Frequently asked questions

What is CVE-2022-29219?: CVE-2022-29219 is a high-severity vulnerability in Chainsafe Lodestar, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2022-05-24.
How severe is CVE-2022-29219?: High severity. CVSS v3 base score is 7.5 out of 10.