PT-2026-42146 · Npm+1 · Vm2

Published 2026-05-20 · Updated 2026-06-12 · CVE-2026-47135

Positive Technologies (AI Summary)

CVSS v3.1

8.7

High

Base vector

AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions vm2 versions prior to 3.11.4

Description An issue exists where the Symbol.for override in setup-sandbox.js only intercepts a small portion of dangerous Node.js cross-realm symbols. This is compounded by the bridge's set(), defineProperty(), and deleteProperty() traps lacking an isDangerousCrossRealmSymbol key check. Consequently, sandbox code can obtain real cross-realm symbols and write them to host objects to control host-side behavior. This has been verified through a util.promisify hijack chain, where sandbox-controlled values are returned to the host. Additionally, this allows for semantic confusion regarding host stream type checks and WebStream internals for any non-frozen host object exposed to the sandbox, potentially bypassing host-side input validation.

Recommendations Update to version 3.11.4. As a temporary workaround, restrict the exposure of non-frozen host objects to the sandbox to minimize the risk of symbol-based property manipulation.

Fix

Protection Mechanism Failure

Weakness Enumeration

CWE-693

Related Identifiers

CVE-2026-47135

GHSA-M5Q2-4FM3-VFQP

Affected Products

Vm2

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-47135 · Security Note
• https://osv.dev/vulnerability/GHSA-m5q2-4fm3-vfqp · Vendor Advisory
• https://github.com/patriksimek/vm2 · Note
• https://github.com/patriksimek/vm2/security/advisories/GHSA-m5q2-4fm3-vfqp · Note
• https://github.com/patriksimek/vm2/releases/tag/v3.11.4 · Note
• https://github.com/patriksimek/vm2/commit/928aef51898b5c52a05f05a40c4cfeb52e172878 · Note
• https://reddit.com/r/CVEWatch/comments/1tih49l/top_10_trending_cves_20052026 · Reddit Post