Vyper extract32 can ready dirty memory
Priority MEDIUM 57CWE-125Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-125 and the CVSS impact.
Summary
Vyper is a pythonic Smart Contract Language for the ethereum virtual machine. When using the built-in `extract32(b, start)`, if the `start` index provided has for side effect to update `b`, the byte array to extract `32` bytes from, it could be that some dirty memory is read and returned by `extract32`. This vulnerability is fixed in 0.4.0.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00561 46th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed vyper (vyperlang): 0.4.0vyper (PyPI): 0.4.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| vyperlang | vyper | before 0.4.0 | 0.4.0 | Patch available | CNA |
| — | vyper (PyPI) | before 0.4.0 | 0.4.0 | Patch available | GHSA-4hwq-4cpm-8vmx |
- vyper Vendorvyperlang Affected before 0.4.0 Fixed in 0.4.0 Patch available CNA
- vyper (PyPI) Vendor— Affected before 0.4.0 Fixed in 0.4.0 Patch available GHSA-4hwq-4cpm-8vmx
Remediation
- Fix · CNA vyper (vyperlang) Fixed in 0.4.0
- Fix · GHSA-4hwq-4cpm-8vmx vyper (PyPI) Fixed in 0.4.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2024-24564
- 2026-10-03 Alias added: GHSA-4hwq-4cpm-8vmx
References
Other 4
- https://github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2024-205.yaml
- https://github.com/vyperlang/vyper
- https://github.com/vyperlang/vyper/blob/10564dcc37756f3d3684b7a91fd8f4325a38c4d8/vyper/builtins/functions.py#L916-L918
- https://github.com/vyperlang/vyper/blob/10564dcc37756f3d3684b7a91fd8f4325a38c4d8/vyper/builtins/functions.py#L920-L922
More vyperlang Vyper vulnerabilities
- TI-2024-16182 Vyper bounds check on built-in `slice()` function can be overflowed CVSS 3.1CRITICAL 9.8
- TI-2024-14992 concat built-in can corrupt memory in vyper CVSS 3.1CRITICAL 9.8
- TI-2024-16184 Vyper array negative index vulnerability CVSS 3.1CRITICAL 9.8
- TI-2022-08657 Integer bounds error in Vyper CVSS 3.1CRITICAL 9.8
- TI-2022-11796 Multiple evaluation of contract address in call in vyper CVSS 3.1HIGH 8.2
- TI-2024-21531 vyper performs double eval of the argument of sqrt CVSS 3.1MEDIUM 5.3
Sources
- CVE-2024-24564 · CVE Program
- CVE-2024-24564 · NVD
- FIRST EPSS
- GHSA-4hwq-4cpm-8vmx · GitHub Advisory Database · CC BY 4.0
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