CVE-2026-18599Public exploit

Authenticated root command execution via record_size injection

Published Aug 3, 2026 · Updated Aug 3, 2026

Command injection in GL.iNet Beryl AX (GL-MT3000) firmware 4.4.0 through 4.4.5 allows remote authenticated users to execute commands as root. The logread.set_config RPC method concatenates the record_size value into an insmod shell command passed to os.execute without numeric coercion or neutralization. Remote authenticated users must obtain an RPC session; injected commands run as root, and command output requires separate redirection and retrieval.

CVSS severity8.0
High
EPSS probability1.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in GL.iNet Beryl AX (GL-MT3000) firmware 4.4.0 through 4.4.5 allows remote authenticated users to execute commands as root. The logread.set_config RPC method concatenates the record_size value into an insmod shell command passed to os.execute without numeric coercion or neutralization. Remote authenticated users must obtain an RPC session; injected commands run as root, and command output requires separate redirection and retrieval.

The record

CVE
CVE-2026-18599
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
GL.iNet
Product
GL-MT3000
Classifications
CWE-74, CWE-77, T1059.004
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.4.0
  2. Affected versionversion=4.4.1
  3. Affected versionversion=4.4.2
  4. Affected versionversion=4.4.3
  5. Affected versionversion=4.4.4
  6. Affected versionversion=4.4.5

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

GL.iNet · GL-MT3000version=4.4.0; version=4.4.1; version=4.4.2; version=4.4.3; version=4.4.4; version=4.4.5

Published CVSS scores

7.7VulDBAV:A/AC:L/Au:S/C:C/I:C/A:C
8.0VulDBCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3VulDBCVSS:4.0/AV:A/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059.004Unix Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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