Vulnerability in Moleculerjs Moleculer
CVE-2026-97705
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Moleculerjs Moleculer — versions < 0.14.36, >= 0.15.0, < 0.15.2
Weakness classification (CWE)
References
- https://github.com/moleculerjs/moleculer/commit/168ecbdc245c9a9d1dc4ef9b8a81dbae38ee3063
- https://github.com/moleculerjs/moleculer/commit/914074e502ae403a0338ad168b45b16d6bcc3e44
- https://github.com/moleculerjs/moleculer/releases/tag/v0.14.36
- https://github.com/moleculerjs/moleculer/releases/tag/v0.15.2
- https://github.com/moleculerjs/moleculer/security/advisories/GHSA-h89v-g948-47vp
Frequently asked questions
- What is CVE-2026-97705?
- CVE-2026-97705 is a high-severity vulnerability in Moleculerjs Moleculer, classified under Loop with Unreachable Exit Condition (Infinite Loop). CVSS score: 7.5/10. Published 2026-11-04.
- How severe is CVE-2026-97705?
- High severity. CVSS v3 base score is 7.5 out of 10.