---
id: CVE-2026-19746
title: A vulnerability has been found in Calix GigaSpire 26.1.0
summary: >-
  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
  dis…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-404
vendor: Calix
product: GigaSpire
affected:
  - GigaSpire 26.1.0
published: '2026-08-13'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T07:17:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19746'
references:
  - url: 'https://vuldb.com/cve/CVE-2026-19746'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/868299'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/389484'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/389484/cti'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
epss: 0.00471
epssPercentile: 0.40534
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-13T19:25:19.686869Z'
ingestedAt: '2026-10-16T07:01:11.484Z'
---

## Overview

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."

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.