CVE-2026-26791: GL-iNet GL-AR300M16 v4.3.11 was discovered to contain a command injection vulnerability via the string port pa

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CRITICAL 9.8REMOTEMITIGATE

CVE-2026-26791 is a critical-severity flaw (CVSS 9.8) affecting ar300m16 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

GL-iNet GL-AR300M16 v4.3.11 was discovered to contain a command injection vulnerability via the string port parameter in the enable_echo_server function. This vulnerability allows attackers to execute arbitrary commands via a crafted input.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-77
Published	2026-03-12
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: gl-inet

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-12 18:16 UTCPublished CVE record published
2026-06-17 10:26 UTCUpdated Record last modified

gl-inet ar300m16 firmware MITIGATE

Affected: 4.3.11

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.3.11

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · fonttools · FIXED · 4.68.0-1.eln159 · FEDORA-2026-37fa4b964c · source

sudo dnf upgrade --advisory=FEDORA-2026-37fa4b964c

Fedora 46 · fonttools · FIXED · 4.68.0-1.fc46 · FEDORA-2026-65d6c01c75 · source

sudo dnf upgrade --advisory=FEDORA-2026-65d6c01c75

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-26791?

ar300m16 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-26791 being exploited?

CVE-2026-26791 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-26791 affect?

CVE-2026-26791 affects ar300m16 firmware. Severity is critical (CVSS 9.8). GL-iNet GL-AR300M16 v4.3.11 was discovered to contain a command injection vulnerability via the string port parameter in the enable_echo_server function. This vulnerability allows attackers to execute arbitrary commands via a crafted input.

How urgent is CVE-2026-26791?

Priority 69/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-26795 CRITICAL 9.8 MITIGATE GL-iNet GL-AR300M16 v4.3.11 was discovered to contain a command injection vulnerability via the module paramet
CVE-2026-26794 HIGH 8.8 MITIGATE GL-iNet GL-AR300M16 v4.3.11 was discovered to contain a SQL injection vulnerability via the add_group() functi
CVE-2026-26793 CRITICAL 9.8 MITIGATE GL-iNet GL-AR300M16 v4.3.11 was discovered to contain a command injection vulnerability via the set_config fun
CVE-2026-26792 CRITICAL 9.8 MITIGATE GL-iNet GL-AR300M16 v4.3.11 was discovered to contain multiple command injection vulnerabilities in the set_up

References

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