CVE-2026-92949: Modification of Assumed-Immutable Data (MAID) in patriksimek vm2
CVE-2026-92949 affects the patriksimek vm2 library versions from 3.9.6 up to but not including 3.11.7. The vulnerability allows sandboxed scripts to bypass protections intended by vm.freeze() and vm.readonly() by improperly restricting access to accessor properties on frozen objects. Attackers can invoke host object setters directly, modifying properties that were explicitly marked as read-only by the embedder.
AI Analysis
Technical Summary
The patriksimek vm2 library versions >=3.9.6 and <3.11.7 contain a vulnerability where sandboxed scripts can bypass vm.freeze() and vm.readonly() protections. This occurs because access to accessor properties on frozen objects is not properly restricted. Attackers can use Object.getOwnPropertyDescriptor() or __lookupSetter__() to extract and invoke host object setters, allowing mutation of properties that should be immutable within the sandbox environment.
Potential Impact
This vulnerability allows attackers running sandboxed scripts to modify properties that the embedder intended to be immutable or read-only. This can lead to unauthorized state changes within the host environment, potentially undermining the sandbox's security guarantees. The CVSS 4.0 base score is 6.3 (medium severity), indicating a moderate impact with network attack vector, high attack complexity, and partial impact on integrity and system integrity.
Mitigation Recommendations
A fix is available in patriksimek vm2 versions 3.11.7 and later. Users should upgrade to version 3.11.7 or newer to remediate this vulnerability. No other mitigation steps are indicated by the vendor advisory data.
CVE-2026-92949: Modification of Assumed-Immutable Data (MAID) in patriksimek vm2
Description
CVE-2026-92949 affects the patriksimek vm2 library versions from 3.9.6 up to but not including 3.11.7. The vulnerability allows sandboxed scripts to bypass protections intended by vm.freeze() and vm.readonly() by improperly restricting access to accessor properties on frozen objects. Attackers can invoke host object setters directly, modifying properties that were explicitly marked as read-only by the embedder.
CVSS v4.0
Score 6.3medium
Affected software
patriksimek
vm2
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The patriksimek vm2 library versions >=3.9.6 and <3.11.7 contain a vulnerability where sandboxed scripts can bypass vm.freeze() and vm.readonly() protections. This occurs because access to accessor properties on frozen objects is not properly restricted. Attackers can use Object.getOwnPropertyDescriptor() or __lookupSetter__() to extract and invoke host object setters, allowing mutation of properties that should be immutable within the sandbox environment.
Potential Impact
This vulnerability allows attackers running sandboxed scripts to modify properties that the embedder intended to be immutable or read-only. This can lead to unauthorized state changes within the host environment, potentially undermining the sandbox's security guarantees. The CVSS 4.0 base score is 6.3 (medium severity), indicating a moderate impact with network attack vector, high attack complexity, and partial impact on integrity and system integrity.
Mitigation Recommendations
A fix is available in patriksimek vm2 versions 3.11.7 and later. Users should upgrade to version 3.11.7 or newer to remediate this vulnerability. No other mitigation steps are indicated by the vendor advisory data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-09-17T12:43:03.568Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aac65c555bf5e2cf5fdf690
Added to database: 09/17/2026, 22:12:21 UTC
Last enriched: 09/17/2026, 22:16:43 UTC
Last updated: 09/18/2026, 00:31:19 UTC
Views: 5
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.