Arista Networks stock: PHP advisory puts cloud services in focus

Arista Networks issued a dated security advisory on October 23, 2026, revised it on October 26, and addressed two critical PHP vulnerabilities. The company says the issues have been remediated in affected cloud services, according to its Security Advisory 0200.

Both CVE-2026-109618 and CVE-2026-109619 concern PHP memory-handling conditions that can enable remote code execution under specific circumstances. Arista lists CVSSv3.1 base scores of 9.8 and CVSSv4.0 scores of 9.2 for both vulnerabilities.

Remediation limits immediate exposure

Arista states that no Arista software products are presently impacted. CloudVision CUE cloud service delivery and Arista Edge Threat Management had already been upgraded to unaffected PHP versions, while the advisory lists Arista EOS products and several other network platforms as not affected. The fixes for affected cloud services are applied automatically, and the company says no customer-side action is required.

The update is therefore an operational remediation notice rather than a reported product disruption. Arista also says it is not aware of malicious exploitation of the vulnerabilities in customer networks.

Course moved since the latest report

Lang & Schwarz quoted Arista at EUR 166.83 on October 29, 2026, at 16:10 CET. The latest relevant own report, published the same day at 11:09 CET, recorded EUR 163.63. The new quote was 1.96 percent higher than that reference. This comparison is separate from a Xetra daily comparison; no Xetra close is stated here.

Investors are also looking toward Arista's third-quarter results for the period ended September 30, 2026. In its October 6 announcement, the company said it would publish the figures after the US market close on November 3 and hold its conference call the same day.

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