8.6
High
CVE-2026-20276 As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XR Software engineering…
Description
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 a software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20276 are related to insufficient control flow management issues that are grouped under the Common Weakness Enumeration (CWE) CWE-691.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Cisco IOS XR Software 26.2 | 26.2.1 → 26.2.101 | No fix stated |
| Cisco IOS XR Software 26.1 | 26.1.1 → 26.1.2 | No fix stated |
| Cisco IOS XR Software 25.4 | 25.4.1 → 25.4.201 | No fix stated |
| Cisco IOS XR Software 25.3 | 25.3.1 → 25.3.15 | No fix stated |
| Cisco IOS XR Software 25.2 | 25.2.1 → 25.2.30 | No fix stated |
| Cisco IOS XR Software 25.1 | 25.1.1 → 25.1.30 | No fix stated |
| Cisco IOS XR Software 24.4 | 24.4.1 → 24.4.30 | No fix stated |
| Cisco IOS XR Software 24.3 | 24.3.1 → 24.3.30 | No fix stated |
| Cisco IOS XR Software 24.2 | 24.2.1 → 24.2.21 | No fix stated |
Show the 17 other branches Hide the 17 other branches
| Product | Affected versions | Fixed in |
|---|---|---|
| Cisco IOS XR Software 24.1 | 24.1.1 → 24.1.2 | No fix stated |
| Cisco IOS XR Software 7.11 | 7.11.1 → 7.11.21 | No fix stated |
| Cisco IOS XR Software 7.10 | 7.10.1 → 7.10.2 | No fix stated |
| Cisco IOS XR Software 7.9 | 7.9.1 → 7.9.21 | No fix stated |
| Cisco IOS XR Software 7.8 | 7.8.1 → 7.8.23 | No fix stated |
| Cisco IOS XR Software 7.7 | 7.7.1 → 7.7.21 | No fix stated |
| Cisco IOS XR Software 7.6 | 7.6.1 → 7.6.15 | No fix stated |
| Cisco IOS XR Software 7.5 | 7.5.1 → 7.5.52 | No fix stated |
| Cisco IOS XR Software 7.4 | 7.4.1 → 7.4.16 | No fix stated |
| Cisco IOS XR Software 7.3 | 7.3.1 → 7.3.27 | No fix stated |
| Cisco IOS XR Software 7.2 | 7.2.0 → 7.2.12 | No fix stated |
| Cisco IOS XR Software 7.1 | 7.1.1 → 7.1.25 | No fix stated |
| Cisco IOS XR Software 7.0 | 7.0.0 → 7.0.90 | No fix stated |
| Cisco IOS XR Software 6.9 | 6.9.1 → 6.9.2 | No fix stated |
| Cisco IOS XR Software 6.8 | 6.8.1 → 6.8.2 | No fix stated |
| Cisco IOS XR Software 6.7 | 6.7.1 → 6.7.35 | No fix stated |
| Cisco IOS XR Software 6.5 | 6.5.25 → 6.5.353 | No fix stated |
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