CVE-2026-102034 Junos OS and Junos OS Evolved: An attacker causes l2ald to restart when MC-LAG ICCP MAC synchronization is enabled
An attacker with ICCP peer access can cause a denial of service by sending malformed MC-LAG messages to the l2ald daemon.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-102034?
CVE-2026-102034 is a high-severity denial of service vulnerability in Juniper Networks Junos OS, published on 14 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A Reachable Assertion vulnerability in the l2ald daemon of Juniper Networks Junos OS and Junos OS Evolved allows an attacker with access to a configured ICCP peer to cause a denial of service via a malformed MC-LAG message.
Weakness: CWE-617
Which versions are affected by CVE-2026-102034?
How do I fix CVE-2026-102034?
No fix has been published for CVE-2026-102034 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-2026-102034 being exploited?
There is no known exploitation of CVE-2026-102034 in the wild and no public exploit code.
Sources
Also known as GHSA-8653-88gj-p79f.