CVE-2024-45056
`fold (xor (shl 1, x), -1) -> (rotl ~1, x)` misoptimization in zksolc
zksolc is a Solidity compiler for ZKsync. All LLVM versions since 2015 fold (xor (shl 1, x), -1) to (rotl ~1, x) if run with optimizations enabled. Here ~1 is generated as an unsigned 64 bits number (2^64-1). This number is zero-extended to 256 bits on EraVM target while it should have been sign-extended. Thus instead of producing roti 2^256 - 1, x the compiler produces rotl 2^64 - 1, x. Analysis has shown that no contracts were affected by the date of publishing this advisory. This issue has been addressed in version 1.5.3. Users are advised to upgrade and redeploy all contracts. There are no known workarounds for this vulnerability.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
`fold (xor (shl 1, x), -1) -> (rotl ~1, x)` misoptimization in zksolc
zksolc is a Solidity compiler for ZKsync. All LLVM versions since 2015 fold (xor (shl 1, x), -1) to (rotl ~1, x) if run with optimizations enabled. Here ~1 is generated as an unsigned 64 bits number (2^64-1). This number is zero-extended to 256 bits on EraVM target while it should have been sign-extended. Thus instead of producing roti 2^256 - 1, x the compiler produces rotl 2^64 - 1, x. Analysis has shown that no contracts were affected by the date of publishing this advisory. This issue has been addressed in version 1.5.3. Users are advised to upgrade and redeploy all contracts. There are no known workarounds for this vulnerability.
- Record
CVE-2024-45056- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-682
- Updated
- 2026-11-02
EUVDEUVD-2024-41287
zksolc is a Solidity compiler for ZKsync. All LLVM versions since 2015 fold (xor (shl 1, x), -1) to (rotl ~1, x) if run with optimizations enabled. Here ~1 is generated as an unsigned 64 bits number (2^64-1). This number is zero-extended to 256 bits on EraVM target while it should have been sign-extended. Thus instead of producing roti 2^256 - 1, x the compiler produces rotl 2^64 - 1, x. Analysis has shown that no contracts were affected by the date of publishing this advisory. This issue has been addressed in version 1.5.3. Users are advised to upgrade and redeploy all contracts. There are no known workarounds for this vulnerability.
- Record
EUVD-2024-41287- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-03
NVD
zksolc is a Solidity compiler for ZKsync. All LLVM versions since 2015 fold (xor (shl 1, x), -1) to (rotl ~1, x) if run with optimizations enabled. Here ~1 is generated as an unsigned 64 bits number (2^64-1). This number is zero-extended to 256 bits on EraVM target while it should have been sign-extended. Thus instead of producing roti 2^256 - 1, x the compiler produces rotl 2^64 - 1, x. Analysis has shown that no contracts were affected by the date of publishing this advisory. This issue has been addressed in version 1.5.3. Users are advised to upgrade and redeploy all contracts. There are no known workarounds for this vulnerability.
- Record
CVE-2024-45056- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-682
- Updated
- 2026-11-02
OSV
`fold (xor (shl 1, x), -1) -> (rotl ~1, x)` misoptimization in zksolc
zksolc is a Solidity compiler for ZKsync. All LLVM versions since 2015 fold (xor (shl 1, x), -1) to (rotl ~1, x) if run with optimizations enabled. Here ~1 is generated as an unsigned 64 bits number (2^64-1). This number is zero-extended to 256 bits on EraVM target while it should have been sign-extended. Thus instead of producing roti 2^256 - 1, x the compiler produces rotl 2^64 - 1, x. Analysis has shown that no contracts were affected by the date of publishing this advisory. This issue has been addressed in version 1.5.3. Users are advised to upgrade and redeploy all contracts. There are no known workarounds for this vulnerability.
- Record
CVE-2024-45056- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-682
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2024-45056 is a medium vulnerability (CVSS 5.9) in Matter-labs Zksolc, published August 29, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. No source names a fixed version.