CVE-2024-45056Public exploitNetwork attack vector

Contract integrity loss via zero-extension miscompile

Published Aug 29, 2024 · Updated Aug 29, 2024

Incorrect calculation in Matter Labs ZKsync Solidity Compiler before 1.5.3 allows attackers to alter contract behavior via crafted source. The EraVM backend zero-extends LLVM's unsigned 64-bit ~1 rotate constant to 256 bits instead of sign-extending it, so optimized bit-clearing code rotates 2^64-1 rather than 2^256-1. The flaw requires optimizations and the affected shift/XOR pattern; it can change deployed bytecode semantics, although Matter Labs found no affected contracts.

CVSS severity5.9
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect calculation in Matter Labs ZKsync Solidity Compiler before 1.5.3 allows attackers to alter contract behavior via crafted source. The EraVM backend zero-extends LLVM's unsigned 64-bit ~1 rotate constant to 256 bits instead of sign-extending it, so optimized bit-clearing code rotates 2^64-1 rather than 2^256-1. The flaw requires optimizations and the affected shift/XOR pattern; it can change deployed bytecode semantics, although Matter Labs found no affected contracts.

The record

CVE
CVE-2024-45056
Published
Aug 29, 2024
Updated
Aug 29, 2024
Vendor
Matter Labs
Product
ZKsync Solidity Compiler
Classifications
CWE-682
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.5.3
  2. Affected versionversion=< 1.5.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Matter Labs · ZKsync Solidity Compilerversion=0 <1.5.3; version=< 1.5.3

Published CVSS scores

5.9GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
5.9NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-682Incorrect Calculation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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