CVE-2023-33964: mx-chain-go does not treat invalid transaction with wrong username correctly

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-05-31 · updated 2026-06-17
Weakness: CWE-20

Description

mx-chain-go is an implementation of the MultiversX blockchain protocol written in the Go language. Metachain cannot process a cross-shard miniblock. Prior to version 1.4.16, an invalid transaction with the wrong username on metachain is not treated correctly on the metachain transaction processor. This is strictly a processing issue that could have happened on MultiversX chain. If an error like this had occurred, the metachain would have stopped notarizing blocks from the shard chains. The resuming of notarization is possible only after applying a patched binary version. A patch in version 1.4.16 introduces `processIfTxErrorCrossShard` for the metachain transaction processor. There are no known workarounds for this issue.

Affected products

multiversx mx-chain-go: before 1.4.16 — fixed in 1.4.16

How to fix

Upgrade to a fixed version: multiversx mx-chain-go 1.4.16. Check the vendor advisory for mitigations.

References

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