SB2026050823 - Remote denial of service in Junos OS ICMPv6 handling
Published: May 8, 2026
Security Bulletin ID
SB2026050823
CSH 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 vulnerability.
1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-33790)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper check for unusual or exceptional conditions in the flow daemon (flowd) when processing a specific malformed ICMPv6 packet during NAT64 translation. A remote attacker can send a specially crafted ICMPv6 packet to cause a denial of service.
This issue requires a NAT64 configuration to be present and cannot be triggered using IPv4 or other IPv6 traffic.
Remediation
Install update from vendor's website.