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CVE-2026-76457

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

HIGH
8.6
CVSS Score
Published: October 7, 2026 at 04:15 PM UTC
Updated: October 8, 2026 at 08:08 PM UTC
2 products affected across 1 vendorNx OSUnified Computing System

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Severity
HIGH8.6
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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-2026-76457 are related to out-of-bounds read issues that are grouped under the Common Weakness Enumeration (CWE) CWE-125.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nx OS· Cisconpm
90%
10.3(1)10.3(2)10.3(3)10.3(3o)10.3(3p)10.3(3q)10.3(3r)10.3(3w)10.3(3x)10.3(4)10.3(4a)10.3(4g)10.3(4h)10.3(5)10.3(6)10.3(7)10.3(8)10.3(9)10.3(99w)10.3(99x)10.4(1)10.4(2)10.4(3)10.4(4)10.4(4g)10.4(5)10.4(6)10.4(7)10.5(1)10.5(1j)10.5(2)10.5(3)10.5(3e)10.5(3o)10.5(3p)10.5(3s)10.5(3t)10.5(4)10.5(5)10.6(1)10.6(1s)10.6(2)10.6(2n)10.6(2s)10.6(3)10.6(3o)10.6(3q)10.6(3s)15.2(1g)15.2(2e)15.2(2f)15.2(2g)15.2(2h)15.2(3e)15.2(3f)15.2(3g)15.2(4d)15.2(4e)15.2(4f)15.2(5c)15.2(5d)15.2(5e)15.2(6e)15.2(6g)15.2(6h)15.2(7f)15.2(7g)15.2(8d)15.2(8e)15.2(8f)15.2(8g)15.2(8h)15.2(8i)15.3(1d)15.3(2a)15.3(2b)15.3(2c)15.3(2d)15.3(2e)15.3(2f)16.0(1g)16.0(1j)16.0(2h)16.0(2j)16.0(3d)16.0(3e)16.0(3g)16.0(4c)16.0(5h)16.0(5j)16.0(6c)16.0(6h)16.0(7e)16.0(8e)16.0(8f)16.0(8h)16.0(9c)16.0(9d)16.0(9e)16.0(9f)16.1(1f)16.1(2f)16.1(2g)16.1(3f)16.1(3g)16.1(4h)16.1(5e)16.2(1g)16.2(2e)7.3(0)D1(1)7.3(0)DX(1)7.3(0)DY(1)7.3(1)D1(1)7.3(1)DY(1)7.3(2)D1(1)7.3(2)D1(1d)7.3(2)D1(2)7.3(2)D1(3)7.3(2)D1(3a)7.3(3)D1(1)7.3(4)D1(1)7.3(5)D1(1)7.3(6)D1(1)7.3(7)D1(1)7.3(8)D1(1)7.3(9)D1(1)8.1(1)8.1(1a)8.1(1b)8.1(2)8.1(2a)8.2(1)8.2(10)8.2(11)8.2(2)8.2(3)8.2(4)8.2(5)8.2(6)8.2(7)8.2(7a)8.2(8)8.2(9)8.3(1)8.3(2)8.4(1)8.4(10)8.4(11)8.4(12)8.4(13)8.4(1a)8.4(2)8.4(2a)8.4(2b)8.4(2c)8.4(2d)8.4(2e)8.4(2f)8.4(3)8.4(4)8.4(4a)8.4(5)8.4(6)8.4(6a)8.4(7)8.4(8)8.4(9)8.5(1)9.2(1)9.2(1a)9.2(2)9.2(2t)9.2(2v)9.2(3)9.2(3y)9.2(4)9.3(1)9.3(10)9.3(11)9.3(12)9.3(13)9.3(14)9.3(15)9.3(16)9.3(17)9.3(1z)9.3(2)9.3(2a)9.3(3)9.3(4)9.3(5)9.3(5w)9.3(6)9.3(7)9.3(7a)9.3(7k)9.3(8)9.3(9)9.4(1)9.4(1a)9.4(2)9.4(2a)9.4(3)9.4(3a)9.4(3b)9.4(4)9.4(5)
Unified Computing System· Cisco
90%
4.0(1a)4.0(1b)4.0(1c)4.0(1d)4.0(2a)4.0(2b)4.0(2d)4.0(2e)4.0(4a)4.0(4b)4.0(4c)4.0(4d)4.0(4e)4.0(4f)4.0(4g)4.0(4h)4.0(4i)4.0(4k)4.0(4l)4.0(4m)4.0(4n)4.0(4o)4.1(1a)4.1(1b)4.1(1c)4.1(1d)4.1(1e)4.1(2a)4.1(2b)4.1(2c)4.1(3a)4.1(3b)4.1(3c)4.1(3d)4.1(3e)4.1(3f)4.1(3h)4.1(3i)4.1(3j)4.1(3k)4.1(3l)4.1(3m)4.1(3n)4.1(4a)4.2(1c)4.2(1d)4.2(1f)4.2(1i)4.2(1k)4.2(1l)4.2(1m)4.2(1n)4.2(2a)4.2(2c)4.2(2d)4.2(2e)4.2(3b)4.2(3d)4.2(3e)4.2(3g)4.2(3h)4.2(3i)4.2(3j)4.2(3k)4.2(3l)4.2(3m)4.2(3n)4.2(3o)4.2(3p)4.2(3r)4.2(3s)4.3(2b)4.3(2c)4.3(2e)4.3(2f)4.3(3a)4.3(3c)4.3(4a)4.3(4b)4.3(4c)4.3(4d)4.3(4e)4.3(4f)4.3(5a)4.3(5c)4.3(5d)4.3(5e)4.3(6a)4.3(6b)4.3(6c)4.3(6d)4.3(6e)4.3(6f)4.3(6g)4.3(6h)4.3(6i)6.0(1b)6.0(1c)6.0(1d)6.0(1e)6.0(1f)6.0(1h)6.0(2b)6.0(2c)6.0(2d)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-hardening-nxosw1-cWzSbtR

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.6HIGHcisco
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-125

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