Low severityNVD Advisory· Published Feb 21, 2025· Updated Feb 22, 2025
AugAssign evaluation order causing OOB write within the object in Vyper
CVE-2025-27105
Description
vyper is a Pythonic Smart Contract Language for the EVM. Vyper handles AugAssign statements by first caching the target location to avoid double evaluation. However, in the case when target is an access to a DynArray and the rhs modifies the array, the cached target will evaluate first, and the bounds check will not be re-evaluated during the write portion of the statement. This issue has been addressed in version 0.4.1 and all users are advised to upgrade. There are no known workarounds for this vulnerability.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
vyperPyPI | < 0.4.1 | 0.4.1 |
Affected products
2Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-4w26-8p97-f4jpghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-27105ghsaADVISORY
- github.com/pypa/advisory-database/tree/main/vulns/vyper/PYSEC-2025-31.yamlghsaWEB
- github.com/vyperlang/vyper/security/advisories/GHSA-4w26-8p97-f4jpghsax_refsource_CONFIRMWEB
News mentions
0No linked articles in our index yet.