CVE-2026-47683Disclosure

MEDIUMCVSS 8.7 · HIGH

Exploit discussion active in current signal (2 latest mentions)

Immediate actions

Patch affected systems immediately
Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft

Recommended action window: High priority (within 72h)

NVD description

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.6, the bufferAllocLimit enforcement in lib/setup-sandbox.js does not cover Buffer.concat(list, totalLength) or Buffer.from(arrayLike) with an attacker-controlled length, allowing sandbox code to perform large synchronous host external-memory allocations that bypass the configured cap and can exhaust the host process. This issue is fixed in version 3.11.6.

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4.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-770

Priority

MEDIUM

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

NONE

Threat summary

Public PoC and exploit tooling are both present
Patch or workaround signal is available
2 mentions across 1 observed day

What's happening

Exploit tool or code specified in 1 signal
PoC mentioned or linked in 1 signal
Patch or workaround mentioned in 1 signal
Technical details provided in 2 signals
Disclosure: 1 classified signal
2 total mentions across 1 day

Deep dive

Activity timeline2 mentions / 1d

Signal classification2 categories

Disclosure

150.0%

Exploit

150.0%

Referenced assets2 URLs

By indicator

Full discourse2 posts

DailyCVE@dailycve45d
Disclosure
🔴 vm2, Memory Exhaustion DoS (bufferAllocLimit Bypass), #CVE-2026-47683 (High) -DC-Aug2026-1560 https://dailycve.com/vm2-memory-exhaustion-dos-bufferalloclimit-bypass-cve-2026-47683-high-dc-aug2026-1560/
Post summary
A new memory‑exhaustion denial‑of‑service vulnerability (CVE‑2026‑47683) in vm2 is announced, with a brief technical description and a link to DailyCVE for details, but no PoC, exploit, patch, or active‑exploitation information.
0000022
228 followersView on X
Upwind Security MDR@UpwindMDR46d
Exploit
🚨Critical - vm2 sandbox escape → host RCE, plus alloc-limit DoS (CVE-2026-47698, CVE-2026-47686, GHSA-m5w8-4gq2-6f8x, CVE-2026-47683, GHSA-v836-6xw4-9cx3) Five flaws in vm2 < 3.11.6. Escape → host RCE: the proto-mutator fix is bypassable via http://indirectcall.call(indirectcall, dangerousmutator, ...); handleException() doesn't sanitize Error.cause, leaking host objects like process; DANGEROUS_BUILTINS omits os/dns, so builtin: ['*'] allows a process-wide DNS hijack. DoS: bufferAllocLimit bypassable via Buffer.concat and TypedArray constructors. 👉Affected: vm2 (npm) ≤ 3.11.5 | Upgrade to 3.11.6
Post summary
A set of five critical vm2 vulnerabilities enabling sandbox escape and host RCE with documented bypass techniques, mitigated by upgrading to version 3.11.6.
0000089
291 followersView on X

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