SB2026050819 - Memory leak in Junos OS and Junos OS Evolved EVPN-MPLS
Published: May 8, 2026
Security Bulletin ID
SB2026050819
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Memory leak (CVE-ID: CVE-2026-33780)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to missing release of memory after effective lifetime in the Layer 2 Address Learning Daemon (l2ald) when processing churn of ESI routes in an EVPN-MPLS scenario. A remote attacker can trigger ESI route churn to cause a denial of service.
The device must be configured for EVPN-MPLS to be exposed to this issue.
Remediation
Install update from vendor's website.