Riskcovery

CVE-2026-76459

Cisco NX-OS Software Security Hardening Release: October 2026 - Out-of-bounds Write Vulnerabilities

State
Published
Severity
9.8 Critical
Published
Oct 7, 2026
Updated
Oct 9, 2026
Reserved
Aug 19, 2026

Read the record on cve.org

Description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco NX-OS engineering team has conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities.

The vulnerabilities tracked by CVE-2026-76459 are related to out-of-bounds write issues that are grouped under the Common Weakness Enumeration (CWE) CWE-787.

Scores

CVSSScoreVectorSource
3.19.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hcisco

Weaknesses

Affected Products

ProductVersions
Cisco NX-OS SoftwareCisco
  • 8.2(5)Affected
  • 7.3(5)D1(1)Affected
  • 8.4(2)Affected
  • 8.4(3)Affected
  • 9.2(3)Affected
  • 8.2(1)Affected
  • 7.3(1)D1(1)Affected
  • 9.2(2v)Affected
  • 7.3(0)D1(1)Affected
  • 7.3(4)D1(1)Affected
  • 9.2(1)Affected
  • 9.2(2t)Affected
  • 9.2(3y)Affected
  • 9.3(2)Affected
  • 7.3(1)DY(1)Affected
  • 8.1(1)Affected
  • 8.2(2)Affected
  • 8.3(2)Affected
  • 7.3(2)D1(3a)Affected
  • 9.2(4)Affected
  • 8.1(2)Affected
  • 7.3(3)D1(1)Affected
  • 8.2(3)Affected
  • 8.3(1)Affected
  • 8.4(1)Affected
  • and 121 more versions
Cisco NX-OS System Software in ACI ModeCisco
  • 15.2(1g)Affected
  • 15.2(2e)Affected
  • 15.2(2f)Affected
  • 15.2(2g)Affected
  • 15.2(2h)Affected
  • 15.2(3f)Affected
  • 15.2(3e)Affected
  • 15.2(3g)Affected
  • 15.2(4d)Affected
  • 15.2(4e)Affected
  • 15.2(5c)Affected
  • 15.2(5d)Affected
  • 16.0(1g)Affected
  • 15.2(5e)Affected
  • 15.2(4f)Affected
  • 15.2(6e)Affected
  • 15.2(6h)Affected
  • 16.0(1j)Affected
  • 15.2(6g)Affected
  • 15.2(7f)Affected
  • 15.2(7g)Affected
  • 16.0(2h)Affected
  • 15.2(8d)Affected
  • 16.0(2j)Affected
  • 15.2(8e)Affected
  • and 36 more versions
Cisco Unified Computing System (Managed)Cisco
  • 4.0(1a)Affected
  • 4.1(1d)Affected
  • 4.0(4f)Affected
  • 4.0(4c)Affected
  • 4.0(2b)Affected
  • 4.1(2a)Affected
  • 4.0(4a)Affected
  • 4.0(4e)Affected
  • 4.0(4h)Affected
  • 4.0(2a)Affected
  • 4.1(1c)Affected
  • 4.0(1b)Affected
  • 4.1(1e)Affected
  • 4.0(4d)Affected
  • 4.0(4b)Affected
  • 4.0(2e)Affected
  • 4.1(1a)Affected
  • 4.0(4g)Affected
  • 4.0(1d)Affected
  • 4.0(1c)Affected
  • 4.0(4i)Affected
  • 4.0(2d)Affected
  • 4.1(1b)Affected
  • 4.1(2b)Affected
  • 4.0(4k)Affected
  • and 80 more versions

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.