Critical [CVE-2026-20274 +6] Cisco IOS XR Software Security Hardening Release: September 2026
This critical-severity Cisco advisory covers CVE-2026-20274 and CVE-2026-20275 and 5 more CVEs affecting IOS XR Software.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations. This bulletin covers 7 CVEs; its score, affected versions and guidance may apply to different issues within that bulletin.
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Summary
As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities.
These vulnerabilities were found during internal testing and are not known to be actively exploited.
To assist customers in patching and streamline the disclosure process, Cisco has grouped these issues by their underlying vulnerability class — Common Weakness Enumeration (CWE) — and assigned a single Common Vulnerabilities and Exposures identifier (CVE ID) to each CWE grouping.
Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities.
- Scope: These vulnerabilities affect all releases of Cisco IOS XR Software, including Cisco IOS XR7 (LNT) Software, regardless of device configuration.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
Mitigation checklist
- There are no workarounds that address these vulnerabilities.
Official advisory · high-confidence parse· fetched 22 days ago·verify at source
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- cisco-sa-notice-I8z3n6lKOct 28, 2026Cisco Advance Notification for Publication of November 4, 2026, Security Advisories
- CVE-2026-105482Oct 27, 2026Vulnerabilities in Node.js Affecting Cisco Products: October 2026
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