CVE-2026-27790 Denial of service in T-20 Readers

Low 2.7 Published 7 Jul 2026 Updated 7 Jul 2026

An authenticated operator can trigger a temporary denial of service on Gallagher T-20 Readers by sending specific requests that cause an uncaught exception.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-27790?

CVE-2026-27790 is a low-severity denial of service vulnerability in Gallagher T-20 Readers, published on 7 Jul 2026. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

Uncaught Exception (CWE-248) in the T20 Readers allows an authenticated and authorized operator to trigger a restart by sending specific requests, resulting in a temporary denial of service. Version of Command Centre affected:

* 9.50 prior to vCR9.50.260616a (distributed in 9.50.1587(MR1)) * 9.40 prior to vCR9.40.260616a (distributed in 9.40.3130(MR3)) * 9.30 prior to vCR9.30.260616a (distributed in 9.30.3983(MR5)) * 9.20 prior to vCR9.20.260616a (distributed in 9.20.4349(MR7)) * all versions of 9.10 and prior.

Weakness: CWE-248

Which versions are affected by CVE-2026-27790?

It affects 1 product.

Products include Gallagher Command Centre.

How do I fix CVE-2026-27790?

No fix has been published for CVE-2026-27790 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-27790 being exploited?

There is no known exploitation of CVE-2026-27790 in the wild and no public exploit code.

Sources

Also known as GHSA-56pq-38g7-f784.