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

Status: published. Published: 2026-11-04. Updated: 2026-11-04.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- moleculerjs / moleculer: >= 0.15.0, < 0.15.2 (affected); < 0.14.36 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-835

## 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-g948-47vp (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/moleculerjs/moleculer/commit/168ecbdc245c9a9d1dc4ef9b8a81dbae38ee3063 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/moleculerjs/moleculer/commit/914074e502ae403a0338ad168b45b16d6bcc3e44 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/moleculerjs/moleculer/releases/tag/v0.14.36 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/moleculerjs/moleculer/releases/tag/v0.15.2 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-97705; retrieved 2026-11-04; source updated 2026-11-04

Revision: 4e535d3c607bad9444a5e428a5a34a14b5cc181623a4256c1106881328d3a037

Canonical: https://y2.dev/cve/CVE-2026-97705

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