CVE-2026-19746 Calix GigaSpire traceroute.cmd denial of service
A remote attacker could potentially cause a denial of service in Calix GigaSpire devices via the traceroute command, though vendor testing did not reproduce the issue.
- 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-2026-19746?
CVE-2026-19746 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 vulnerability has been found in Calix GigaSpire 26.1.0. The affected element is an unknown function of the file traceroute.cmd. The manipulation leads to denial of service. The attack may be initiated remotely. The exploit has been disclosed to the public and may be used. The presence of this vulnerability remains uncertain at this time. The vendor explains: "After reviewing the researcher's videos, we repeated the test using his described setup: the traceroute cancel request was sent while a second client was connected to the EWI. The second client remained connected and was not interrupted, and we did not observe a forced logout, session invalidation, or loss of EWI availability."
Weakness: CWE-404
Which versions are affected by CVE-2026-19746?
How do I fix CVE-2026-19746?
No fix has been published for CVE-2026-19746 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-2026-19746 being exploited?
There is no known exploitation of CVE-2026-19746 in the wild and no public exploit code.
Sources
Also known as GHSA-6w9r-x9gv-7c46.