---
id: CVE-2026-19745
title: A flaw has been found in Calix GigaSpire 26.1.0
summary: >-
  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 denia…
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: '2026-10-16T07:17:12.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19745'
references:
  - url: 'https://vuldb.com/cve/CVE-2026-19745'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/868298'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/389483'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/389483/cti'
    label: cna@vuldb.com
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00471
epssPercentile: 0.40534
exploitAvailable: true
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-14T16:40:06.855802Z'
ingestedAt: '2026-10-16T07:01:11.483Z'
---

## Overview

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."

## Remediation

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