CVE-2026-97705
Moleculer: Unauthenticated Denial of Service via negative length field in the TCP transporter packet parser
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| moleculer moleculerjs |
>= 0.15.0, < 0.15.2 (affected) < 0.14.36 (affected) |
CNA: GitHub_M |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/moleculerjs/moleculer/security/advisories/GHSA-h89v-g948-47vpCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/moleculerjs/moleculer/commit/168ecbdc245c9a9d1dc4ef9b8a81dbae38ee3063CNA: GitHub_M · x_refsource_MISC
- https://github.com/moleculerjs/moleculer/commit/914074e502ae403a0338ad168b45b16d6bcc3e44CNA: GitHub_M · x_refsource_MISC
- https://github.com/moleculerjs/moleculer/releases/tag/v0.14.36CNA: GitHub_M · x_refsource_MISC
- https://github.com/moleculerjs/moleculer/releases/tag/v0.15.2CNA: GitHub_M · x_refsource_MISC
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