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CVE-2026-97705— Moleculer: Unauthenticated Denial of Service via negative length field in the TCP transporter packet parser

Quick assessment

Affected
moleculerjs moleculer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Moleculer 是一个面向 Node.js 的渐进式微服务框架。在版本 0.14.36 和 0.15.2 之前， 中的 方法使用 读取有符号的数据包长度。这导致远程未认证的攻击者可以传入一个负值，使得 返回原始缓冲区（未发生切片），而 循环却会无限持续。该同步循环阻塞了 Node.js 的事件循环，导致进程中所有服务无法响应，直到服务重启。此漏洞需要 TCP 传输层（transporter）已启用且可被访问；同时，CRC 校验和 限制均无法阻止这种畸形的长度值。该问题已在版本 0.14.36 和 0.15.2

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 2

VendorProduct Version RangeStatus
moleculerjs moleculer >= 0.15.0, < 0.15.2 affected
< 0.14.36 affected
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I. Basic Information for CVE-2026-97705

Vulnerability Information
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Vulnerability Title
Moleculer: Unauthenticated Denial of Service via negative length field in the TCP transporter packet parser
Source: CVE Program / CVE List V5
Vulnerability Description
Moleculer is a progressive microservices framework for Node.js. Prior to 0.14.36 and 0.15.2, Parser._write in src/transporters/tcp/parser.js used Buffer.prototype.readInt32BE to read a signed packet length, so a remote unauthenticated peer could supply a negative value that caused packet.slice(length) to return the unchanged buffer while the while (packet.length > 0) loop continued indefinitely. The synchronous loop blocked the Node.js event loop and made every service in the process unresponsive until restart. The TCP transporter must be enabled and reachable, and neither CRC validation nor maxPacketSize prevents the malformed length value. This issue is fixed in versions 0.14.36 and 0.15.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
moleculerjs moleculer >= 0.15.0, < 0.15.2 -

II. Public POCs for CVE-2026-97705

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III. Intelligence Information for CVE-2026-97705

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Other References for CVE-2026-97705 (5)

IV. Related Vulnerabilities

Same weakness: CWE-835