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CVE-2025-27105

26
FAUCET Score

CVE-2025-27105 is a critical vulnerability affecting Vyper, a Pythonic Smart Contract Language for the EVM, specifically versions prior to 0.4.1. The flaw lies in how Vyper handles AugAssign statements with dynamic arrays, where an improper bounds check can occur, leading to potential memory corruption (CWE-787). This vulnerability has a CVSS score of 9.1 (CRITICAL), indicating it can be exploited remotely with low attack complexity, resulting in high impact to integrity and availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.4.1CPE matchmatch criteria
cpe:2.3:a:vyperlang:vyper:*:*:*:*:*:python:*:*

CVSS Data

CVSS version used by this source: 4.0

2.3LOW

CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
VS Confidentiality
LOW
VS Integrity
LOW
VS Availability
LOW
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.55%
Probability of exploitation in next 30 days
EPSS Percentile
42.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0055 is in the 22nd percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

pippatch availablevia ghsa
Product: vyperFixed in: 0.4.1
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

pipGHSA-4w26-8p97-f4jplow

AugAssign evaluation order causing OOB write within the object in Vyper

Feb 21, 2025

References

github.com / vyperlang/vyper/security/advisories/GHSA-4w26-8p97-f4jp
ExploitVendor Advisory