What is CVE-2026-121286?

CVE-2026-121286 is a medium-severity vulnerability in Arista Networks Eos, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-11-10.

How severe is CVE-2026-121286?

Medium severity. CVSS v3 base score is 6.5 out of 10.

NULL pointer dereference in Arista Networks Eos

CVE-2026-121286

On affected platforms running Arista EOS in multi-agent routing model with BGP Segment Routing Traffic Engineering (SR-TE) address family configured, a BGP peer can send crafted BGP packets to cause the BGP process to restart, disrupting all BGP sessions on the device.

Published 2026-11-10.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Arista Networks Eos

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

www.arista.com/en/support/advisories-notices/security-advisory/25035-security-a… (vendor-advisory)

Frequently asked questions

What is CVE-2026-121286?: CVE-2026-121286 is a medium-severity vulnerability in Arista Networks Eos, classified under NULL Pointer Dereference. CVSS score: 6.5/10. Published 2026-11-10.
How severe is CVE-2026-121286?: Medium severity. CVSS v3 base score is 6.5 out of 10.