HOMEVULNERABILITIESCVE-2023-46247
HIGH

CVE-2023-46247

CWE-193Published: December 13, 2023· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). Contracts containing large arrays might underallocate the number of slots they need by 1. Prior to v0.3.8, the calculation to determine how many slots a storage variable needed used `math.ceil(type_.size_in_bytes / 32)`. The intermediate floating point step can produce a rounding error if there are enough bits set in the IEEE-754 mantissa. Roughly speaking, if `type_.size_in_bytes` is large (> 2**46), and slightly less than a power of 2, the calculation can overestimate how many slots are needed by 1. If `type_.size_in_bytes` is slightly more than a power of 2, the calculation can underestimate how many slots are needed by 1. This issue is patched in version 0.3.8.

NVD Source

Technical Analysis

CVE-2023-46247 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

vyperlang1 product(s)
vyper
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/vyperlang/vyper/commit/0bb7203b584e771b23536ba065a6efda457161bb
PATCHhttps://github.com/vyperlang/vyper/commit/0bb7203b584e771b23536ba065a6efda457161bb
ADVISORYhttps://github.com/vyperlang/vyper/security/advisories/GHSA-6m97-7527-mh74
ADVISORYhttps://github.com/vyperlang/vyper/security/advisories/GHSA-6m97-7527-mh74

All References (6)

→
https://github.com/vyperlang/vyper/blob/6020b8bbf66b062d299d87bc7e4eddc4c9d1c157/vyper/semantics/validation/data_positions.py#L197Product
→
https://github.com/vyperlang/vyper/commit/0bb7203b584e771b23536ba065a6efda457161bbPatch
→
https://github.com/vyperlang/vyper/security/advisories/GHSA-6m97-7527-mh74Third Party Advisory
→
https://github.com/vyperlang/vyper/blob/6020b8bbf66b062d299d87bc7e4eddc4c9d1c157/vyper/semantics/validation/data_positions.py#L197Product
→
https://github.com/vyperlang/vyper/commit/0bb7203b584e771b23536ba065a6efda457161bbPatch
→
https://github.com/vyperlang/vyper/security/advisories/GHSA-6m97-7527-mh74Third Party Advisory

Quick Facts

CVE IDCVE-2023-46247
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-193
CISA KEVNo
Affected1 vendor(s)
PublishedDec 13, 2023

Related CVEs (CWE-193)

CVE-2024-10442
10.0
CVE-2025-54349
10.0
CVE-2022-34970
9.8
CVE-2002-0083
9.8
CVE-2020-6835
9.8
CVE-2025-43973
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-46247 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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