CVE-2026-19745 Calix GigaSpire Web Management utilities_configurationsave.cgi denial of service
Remote attackers may cause denial of service in Calix GigaSpire web management via sessionKey manipulation, though vendor disputes impact.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-19745?
CVE-2026-19745 is a medium-severity denial of service vulnerability in Calix GigaSpire, published on 13 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A flaw has been found in Calix GigaSpire 26.1.0. Impacted is an unknown function of the file utilities_configurationsave.cgi of the component Web Management Interface. Executing a manipulation of the argument sessionKey can lead to denial of service. The attack can be launched remotely. The exploit has been published and may be used. The existence of this vulnerability is still disputed at present. The vendor explains: "We reproduced the reported request pattern. The observed delay results from expected input-timeout handling while the handler waits for input data. We did not observe a backend crash, resource exhaustion, service instability, or loss of EWI availability, and the interface remained accessible during and after testing."
Weakness: CWE-404
Which versions are affected by CVE-2026-19745?
How do I fix CVE-2026-19745?
No fix has been published for CVE-2026-19745 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-2026-19745 being exploited?
There is no known exploitation of CVE-2026-19745 in the wild and no public exploit code.
Sources
Also known as GHSA-693x-w4h4-3ppc.