SB20261109109 - Type Confusion in isolated-vm
Published: November 9, 2026
Security Bulletin ID
SB20261109109
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Type Confusion (CVE-ID: N/A)
CWE-ID: CWE-843 - Type confusion
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a low-privileged attacker to escape an isolated-vm sandbox and hijack control flow in the host process.
The vulnerability exists due to type confusion in ExternalCopy when a transferList getter returns different values during validation and subsequent unchecked use. A low-privileged attacker executing guest code with access to an ivm.Reference can obtain the constructor and supply a stateful getter that triggers host memory corruption.
Remediation
Install update from vendor's website.