SB2026012013 - Denial of service in Junos OS during telemetry sensors subscription
Published: January 20, 2026
Security Bulletin ID
SB2026012013
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Stack-based buffer overflow (CVE-ID: CVE-2026-21903)
The vulnerability allows a remote user to perform a denial of service attack.
The vulnerability exists due to a boundary error in the Packet Forwarding Engine (pfe). A remote user can subscribe to telemetry sensors at scale, trigger a stack-based buffer overflow and perform a denial of service attack.
Remediation
Install update from vendor's website.