Summary

• Cisco released its semiannual Cisco IOS XR Software Security Advisory Bundled Publication on March 11, 2026. In direct response to customer feedback, Cisco releases bundles of Cisco IOS XR Software Security Advisories on the second Wednesday of the month in March and September of each calendar year.

  The March 11, 2026, release of the Cisco IOS XR Software Security Advisory Bundled Publication includes three Cisco Security Advisories that describe four vulnerabilities in Cisco IOS XR Software. Cisco has released software updates that address these vulnerabilities.

Details

• The following table identifies Cisco Security content that is associated with this bundled publication:

  Cisco Security Advisory	CVE ID	Security Impact Rating	CVSS Base Score
  Cisco IOS XR Software CLI Privilege Escalation Vulnerabilities	CVE-2026-20040 CVE-2026-20046	High	8.8
  Cisco IOS XR Software Multi-Instance Intermediate System-to-Intermediate System Denial of Service Vulnerability	CVE-2026-20074	High	7.4
  Cisco IOS XR Egress Packet Network Interface Aligner Interrupt Denial of Service Vulnerability	CVE-2026-20118	High	6.8

   

  Related Resources

  Cisco Security Vulnerability Policy
  MITRE Common Vulnerabilities and Exposures
  Common Vulnerability Scoring System and the Security Impact Rating
  Common Vulnerability Scoring System Q & A