NoMachine nxwebrunner Heap-based Buffer Overflow Remote Code Execution Vulnerability
Affects NoMachine's nxwebrunner web service when it listens on its default TCP port 4443. Fixed in 10.1.7, 9.9.6 and 8.27.1.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 10.1.7, 9.9.6, 8.27.1
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 10.1.7, 9.9.6, 8.27.1.
- Exploitation?/40Exploitation: unknown (data gap). No CISA SSVC exploitation rating yet
- Exposure17/25No login or user action needed, reachable over the network without a login · Data gap: Advisories don't say whether default setups are affected
- Reach?/20Reach: unknown (data gap). No tracked technology or package matched
- Severity9.8/10CVSS 9.8
- No patch0/5No signal
What would change the score
- Would score about 72 if added to CISA KEV
- Would score about 67 if CISA's SSVC rates exploitation active
- Would score about 32 if advisories confirm default setups are exposed
CVE-2026-114549 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.8 (critical) and affects NoMachine; fixed in 10.1.7, 9.9.6 and 8.27.1.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 27/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Unclear
- Fix
- Fixed in 10.1.7, 9.9.6, 8.27.1
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
NoMachine remote access software, specifically its nxwebrunner web service (listening on TCP port 4443 by default), is affected by this flaw. An unauthenticated remote attacker could exploit it to run arbitrary code with the privileges of the service account on the affected system.
Read the original description
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.
What to do
Upgrade to a fixed version: 10.1.7, 9.9.6, 8.27.1.
Timeline
- CVE published
- First seen by cve.now1 day
- Posted on X by cve.now
Affected versions
- NoMachine NoMachine
9.7.3
Evidence 1
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-114549
Is CVE-2026-114549 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
A heap-based buffer overflow in the nxwebrunner web service can let an attacker run arbitrary code in the context of the service account.Source: zerodayinitiative.com
Which versions are affected by CVE-2026-114549?
NoMachine: version 9.7.3.Source: cve.now feed data
Am I affected, and how do I check?
The flaw is in NoMachine's nxwebrunner web service, which listens on TCP port 4443 by default. Check whether that service is listening on port 4443 and which NoMachine version is installed, then compare the version with the fixed releases 8.27.1, 9.9.6 and 10.1.7.Source: zerodayinitiative.com
How do I fix CVE-2026-114549?
Upgrade to the fixed release on the same release line as the installed version: 8.27.1, 9.9.6 or 10.1.7. The sources list no workaround.Source: zerodayinitiative.com