# CVE-2026-114549: NoMachine nxwebrunner Heap-based Buffer Overflow Remote Code Execution Vulnerability

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

NoMachine nxwebrunner Heap-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of NoMachine. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the web service, which listens on TCP port 4443 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a heap-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-30685.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- NoMachine / NoMachine: 9.7.3 (affected). Source: CNA: zdi

## Severity and prioritization

- CVSS 3.0: 9.8 (critical); CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: zdi

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-122

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://www.zerodayinitiative.com/advisories/ZDI-26-786/ (CNA: zdi; x_research-advisory)

## Provenance

- CNA: zdi: https://www.cve.org/CVERecord?id=CVE-2026-114549; retrieved 2026-11-04; source updated 2026-11-03

Revision: 857a5f8fb01f0a78f9432a980b3f71b78f853ececea33bfefad4e3c3157c08d8

Canonical: https://y2.dev/cve/CVE-2026-114549

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.