Bug 2347040 (CVE-2025-27105) - CVE-2025-27105 vyper: AugAssign evaluation order causing OOB write within the object in Vyper
Summary: CVE-2025-27105 vyper: AugAssign evaluation order causing OOB write within the...
Keywords:
Status: NEW
Alias: CVE-2025-27105
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
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Depends On: 2347310 2347311
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-02-21 22:01 UTC by OSIDB Bzimport
Modified: 2025-02-26 16:43 UTC (History)
0 users

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Description OSIDB Bzimport 2025-02-21 22:01:17 UTC 
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.
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