CVE-2026-76456 vulnerability in Cisco Products
Published on October 7, 2026
Cisco NX-OS Software Security Hardening Release: October 2026 - Improper Input Validation Vulnerabilities
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-2026-76456 are related to improper input validation of special elements used in a command issue that are grouped under the Common Weakness Enumeration (CWE) CWE-20.
Vulnerability Analysis
CVE-2026-76456 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
CHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH
Weakness Type
Improper Input Validation
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Products Associated with CVE-2026-76456
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Affected Versions
Cisco NX-OS Software:- Version 8.2(5) is affected.
- Version 7.3(5)D1(1) is affected.
- Version 8.4(2) is affected.
- Version 8.4(3) is affected.
- Version 9.2(3) is affected.
- Version 8.2(1) is affected.
- Version 7.3(1)D1(1) is affected.
- Version 9.2(2v) is affected.
- Version 7.3(0)D1(1) is affected.
- Version 7.3(4)D1(1) is affected.
- Version 9.2(1) is affected.
- Version 9.2(2t) is affected.
- Version 9.2(3y) is affected.
- Version 9.3(2) is affected.
- Version 7.3(1)DY(1) is affected.
- Version 8.1(1) is affected.
- Version 8.2(2) is affected.
- Version 8.3(2) is affected.
- Version 7.3(2)D1(3a) is affected.
- Version 9.2(4) is affected.
- Version 8.1(2) is affected.
- Version 7.3(3)D1(1) is affected.
- Version 8.2(3) is affected.
- Version 8.3(1) is affected.
- Version 8.4(1) is affected.
- Version 8.1(1b) is affected.
- Version 7.3(0)DX(1) is affected.
- Version 7.3(2)D1(1) is affected.
- Version 9.3(1) is affected.
- Version 7.3(2)D1(2) is affected.
- Version 8.2(4) is affected.
- Version 7.3(0)DY(1) is affected.
- Version 9.3(1z) is affected.
- Version 9.2(2) is affected.
- Version 8.1(2a) is affected.
- Version 7.3(2)D1(3) is affected.
- Version 8.1(1a) is affected.
- Version 8.4(1a) is affected.
- Version 9.3(3) is affected.
- Version 7.3(2)D1(1d) is affected.
- Version 9.3(4) is affected.
- Version 7.3(6)D1(1) is affected.
- Version 8.2(6) is affected.
- Version 9.3(5) is affected.
- Version 8.4(2a) is affected.
- Version 8.4(2b) is affected.
- Version 8.5(1) is affected.
- Version 9.3(6) is affected.
- Version 8.4(4) is affected.
- Version 7.3(7)D1(1) is affected.
- Version 8.4(2c) is affected.
- Version 9.3(5w) is affected.
- Version 8.2(7) is affected.
- Version 9.3(7) is affected.
- Version 9.3(7k) is affected.
- Version 7.3(8)D1(1) is affected.
- Version 9.3(7a) is affected.
- Version 8.2(7a) is affected.
- Version 9.3(8) is affected.
- Version 8.4(4a) is affected.
- Version 8.4(2d) is affected.
- Version 8.4(5) is affected.
- Version 8.2(8) is affected.
- Version 9.3(9) is affected.
- Version 7.3(9)D1(1) is affected.
- Version 8.4(6) is affected.
- Version 8.4(2e) is affected.
- Version 9.3(10) is affected.
- Version 9.2(1a) is affected.
- Version 8.2(9) is affected.
- Version 10.3(1) is affected.
- Version 8.4(7) is affected.
- Version 10.3(2) is affected.
- Version 8.4(6a) is affected.
- Version 9.3(11) is affected.
- Version 10.3(3) is affected.
- Version 9.4(1) is affected.
- Version 9.3(2a) is affected.
- Version 8.4(2f) is affected.
- Version 8.2(10) is affected.
- Version 9.3(12) is affected.
- Version 10.4(1) is affected.
- Version 8.4(8) is affected.
- Version 10.3(99w) is affected.
- Version 10.3(3w) is affected.
- Version 10.3(99x) is affected.
- Version 10.3(3o) is affected.
- Version 8.4(9) is affected.
- Version 10.3(4) is affected.
- Version 10.3(3p) is affected.
- Version 10.3(4a) is affected.
- Version 9.4(1a) is affected.
- Version 10.4(2) is affected.
- Version 10.3(3q) is affected.
- Version 9.3(13) is affected.
- Version 8.2(11) is affected.
- Version 9.4(2) is affected.
- Version 10.3(5) is affected.
- Version 10.4(3) is affected.
- Version 10.3(3x) is affected.
- Version 10.3(4g) is affected.
- Version 10.5(1) is affected.
- Version 8.4(10) is affected.
- Version 9.4(2a) is affected.
- Version 10.3(3r) is affected.
- Version 10.3(6) is affected.
- Version 9.3(14) is affected.
- Version 10.4(4) is affected.
- Version 10.3(4h) is affected.
- Version 10.5(2) is affected.
- Version 10.5(1j) is affected.
- Version 8.4(11) is affected.
- Version 9.4(3) is affected.
- Version 10.3(7) is affected.
- Version 10.4(5) is affected.
- Version 10.5(3) is affected.
- Version 9.3(15) is affected.
- Version 9.4(3a) is affected.
- Version 10.4(4g) is affected.
- Version 10.5(4) is affected.
- Version 9.4(3b) is affected.
- Version 8.4(12) is affected.
- Version 10.6(1) is affected.
- Version 10.5(3t) is affected.
- Version 10.3(8) is affected.
- Version 10.4(6) is affected.
- Version 10.5(3s) is affected.
- Version 10.5(3e) is affected.
- Version 9.4(4) is affected.
- Version 10.5(3o) is affected.
- Version 9.3(16) is affected.
- Version 10.6(1s) is affected.
- Version 10.6(2) is affected.
- Version 10.5(3p) is affected.
- Version 9.4(5) is affected.
- Version 10.3(9) is affected.
- Version 10.6(2s) is affected.
- Version 8.4(13) is affected.
- Version 10.6(3) is affected.
- Version 10.4(7) is affected.
- Version 10.5(5) is affected.
- Version 9.3(17) is affected.
- Version 10.6(2n) is affected.
- Version 10.6(3q) is affected.
- Version 10.6(3o) is affected.
- Version 10.6(3s) is affected.
- Version 7.3(18)N1(1) is affected.
- Version 15.2(1g) is affected.
- Version 15.2(2e) is affected.
- Version 15.2(2f) is affected.
- Version 15.2(2g) is affected.
- Version 15.2(2h) is affected.
- Version 15.2(3f) is affected.
- Version 15.2(3e) is affected.
- Version 15.2(3g) is affected.
- Version 15.2(4d) is affected.
- Version 15.2(4e) is affected.
- Version 15.2(5c) is affected.
- Version 15.2(5d) is affected.
- Version 16.0(1g) is affected.
- Version 15.2(5e) is affected.
- Version 15.2(4f) is affected.
- Version 15.2(6e) is affected.
- Version 15.2(6h) is affected.
- Version 16.0(1j) is affected.
- Version 15.2(6g) is affected.
- Version 15.2(7f) is affected.
- Version 15.2(7g) is affected.
- Version 16.0(2h) is affected.
- Version 15.2(8d) is affected.
- Version 16.0(2j) is affected.
- Version 15.2(8e) is affected.
- Version 16.0(3d) is affected.
- Version 16.0(3e) is affected.
- Version 15.2(8f) is affected.
- Version 15.2(8g) is affected.
- Version 15.3(1d) is affected.
- Version 15.2(8h) is affected.
- Version 16.0(4c) is affected.
- Version 15.3(2a) is affected.
- Version 15.2(8i) is affected.
- Version 16.0(5h) is affected.
- Version 15.3(2b) is affected.
- Version 16.0(3g) is affected.
- Version 16.0(5j) is affected.
- Version 15.3(2c) is affected.
- Version 16.0(6c) is affected.
- Version 15.3(2d) is affected.
- Version 16.1(1f) is affected.
- Version 16.0(7e) is affected.
- Version 16.0(8e) is affected.
- Version 15.3(2e) is affected.
- Version 16.0(8f) is affected.
- Version 16.1(2f) is affected.
- Version 16.1(2g) is affected.
- Version 15.3(2f) is affected.
- Version 16.0(9c) is affected.
- Version 16.1(3f) is affected.
- Version 16.0(9d) is affected.
- Version 16.0(6h) is affected.
- Version 16.0(8h) is affected.
- Version 16.1(3g) is affected.
- Version 16.0(9e) is affected.
- Version 16.1(4h) is affected.
- Version 16.1(5e) is affected.
- Version 16.2(1g) is affected.
- Version 16.0(9f) is affected.
- Version 16.2(2e) is affected.
- Version 4.0(1a) is affected.
- Version 4.1(1a) is affected.
- Version 4.1(1b) is affected.
- Version 4.0(4h) is affected.
- Version 4.1(1c) is affected.
- Version 4.0(4e) is affected.
- Version 4.0(4g) is affected.
- Version 4.0(2e) is affected.
- Version 4.0(4a) is affected.
- Version 4.0(2d) is affected.
- Version 4.0(1b) is affected.
- Version 4.0(4f) is affected.
- Version 4.0(4c) is affected.
- Version 4.0(1c) is affected.
- Version 4.0(4b) is affected.
- Version 4.0(2b) is affected.
- Version 4.0(4d) is affected.
- Version 4.0(2a) is affected.
- Version 4.0(1d) is affected.
- Version 4.0(4i) is affected.
- Version 4.1(1d) is affected.
- Version 4.1(2a) is affected.
- Version 4.1(1e) is affected.
- Version 4.1(2b) is affected.
- Version 4.0(4k) is affected.
- Version 4.1(3a) is affected.
- Version 4.1(3b) is affected.
- Version 4.1(2c) is affected.
- Version 4.0(4l) is affected.
- Version 4.1(4a) is affected.
- Version 4.1(3c) is affected.
- Version 4.1(3d) is affected.
- Version 4.2(1c) is affected.
- Version 4.2(1d) is affected.
- Version 4.0(4m) is affected.
- Version 4.1(3e) is affected.
- Version 4.2(1f) is affected.
- Version 4.1(3f) is affected.
- Version 4.2(1i) is affected.
- Version 4.1(3h) is affected.
- Version 4.2(1k) is affected.
- Version 4.2(1l) is affected.
- Version 4.0(4n) is affected.
- Version 4.2(1m) is affected.
- Version 4.1(3i) is affected.
- Version 4.2(2a) is affected.
- Version 4.2(1n) is affected.
- Version 4.1(3j) is affected.
- Version 4.2(2c) is affected.
- Version 4.2(2d) is affected.
- Version 4.2(3b) is affected.
- Version 4.1(3k) is affected.
- Version 4.0(4o) is affected.
- Version 4.2(2e) is affected.
- Version 4.2(3d) is affected.
- Version 4.2(3e) is affected.
- Version 4.2(3g) is affected.
- Version 4.1(3l) is affected.
- Version 4.3(2b) is affected.
- Version 4.2(3h) is affected.
- Version 4.2(3i) is affected.
- Version 4.3(2c) is affected.
- Version 4.1(3m) is affected.
- Version 4.3(2e) is affected.
- Version 4.3(3a) is affected.
- Version 4.2(3j) is affected.
- Version 4.3(3c) is affected.
- Version 4.3(4a) is affected.
- Version 4.2(3k) is affected.
- Version 4.3(4b) is affected.
- Version 4.3(4c) is affected.
- Version 4.2(3l) is affected.
- Version 4.3(4d) is affected.
- Version 4.3(2f) is affected.
- Version 4.2(3m) is affected.
- Version 4.3(5a) is affected.
- Version 4.3(4e) is affected.
- Version 4.1(3n) is affected.
- Version 4.3(4f) is affected.
- Version 4.2(3n) is affected.
- Version 4.3(5c) is affected.
- Version 4.2(3o) is affected.
- Version 4.3(5d) is affected.
- Version 4.3(6a) is affected.
- Version 4.3(6b) is affected.
- Version 4.3(5e) is affected.
- Version 4.3(6c) is affected.
- Version 6.0(1b) is affected.
- Version 4.2(3p) is affected.
- Version 6.0(1c) is affected.
- Version 4.3(6d) is affected.
- Version 6.0(1d) is affected.
- Version 6.0(1e) is affected.
- Version 4.3(6e) is affected.
- Version 6.0(1f) is affected.
- Version 4.3(6f) is affected.
- Version 6.0(2b) is affected.
- Version 6.0(1h) is affected.
- Version 4.2(3r) is affected.
- Version 6.0(2c) is affected.
- Version 4.3(6g) is affected.
- Version 6.0(2d) is affected.
- Version 4.3(6h) is affected.
- Version 4.2(3s) is affected.
- Version 4.3(6i) is affected.