Evidence used
- No CISA KEV confirmation is currently recorded.
- EPSS is 0.28% for the current model date.
BlackTreeCVE IntelligenceFull vulnerability report · 2026
CVE-2026-76459High confidence
Cisco NX-OS Software Security Hardening Release: October 2026 - Out-of-bounds Write Vulnerabilities
Cisco · Cisco NX-OS Software
Official source article: Cisco CISCO-SA-HARDENING-NXOSW1-CWZSBTR ↗. Check the applicable product and release in the original source.
8.8HighCVSS 3.1
Patch only the product branches with a verified fix
Fix availability varies by productHigh technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 350 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
R
Open reassessment dashboard →Operational reassessment
Published severity in operational context
Published severityHigh→Operational priority:High, unchanged from published severity.unchanged
Compensating controls
- Validate the affected product branch and deploy the verified fixed release.
- Restrict the affected network interface to trusted sources where business-safe.
- Monitor vendor guidance and exploitation sources for a material change.
Verification
- Confirm that the asset runs Cisco Cisco NX-OS Software and falls inside the recorded affected range.
- Verify the installed build against the product-specific fixed version after deployment.
- Validate exposure, authentication requirements and compensating controls in the actual environment.
- Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Remediation availability differs by product scope
Verified remediation exists for at least one product or source, but 350 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
- Cisco PSIRT: 350 affected or under-investigation product states without a fixed product state in the same current advisory
Direct vendor intelligence
1 currentAuthoritative vendor CSAF and VEX advisories
Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.
cisco-sa-hardening-nxosw1-cWzSbtR · CSAF 2.0 · revision 1.0.0 · finalCisco PSIRTCisco NX-OS Software Security Hardening Release: October 2026 - Out-of-bounds Write Vulnerabilities
The vendor explicitly identifies these products as affected by this CVE.
- 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(5c)
- 15.2(5d)
- Summary
- Complete.
- Remediation
- Cisco has released software updates that address this vulnerability.
High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 350 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.
Fix availability varies by product01
What, why and how
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.
What
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.
Why
A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.
How
An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
What
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.
Why
A bounds error lets data be written beyond the intended memory region, potentially corrupting control data.
How
An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.
02
Exploit reality and attack path
CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.
Observed exploitation No confirmed evidence
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.
Public PoC / exploit material None recorded
?
Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.
- Likely attack path
- a network path → Out-of-bounds Write → cause the confidentiality, integrity or availability impact described by the vendor
- Attack surface
- Network
- Privileges required
- Low: a basic authenticated account is required
- User interaction
- None
- Attack complexity
- Low: no specialised conditions are recorded
- Security boundary
- Unchanged: impact remains within the vulnerable component's security authority
- Weakness
?
CWE means Common Weakness Enumeration: a standard category for the underlying weakness. - CWE-787 ↗
CWE-787: Out-of-bounds Write. The product writes data past the end, or before the beginning, of the intended buffer.
- CVSS vector
?
CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity. CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HCommon Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.
AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.AHighAvailability impact: A successful attack can cause a major loss.- Post-exploitation / living off the land
- No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
03
Patch and workaround
Operational remediation based on structured source evidence.
- Status
?
Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change. - Fix availability varies by product
- Affected
- Action
- Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
- Workaround
- No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04
Evidence and provenance
Published 7 Oct 2026 · Last source change 8 Oct 2026, 13:02 UTC · CWE-787 · Out-of-bounds Write
CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source FIRST · tracked since 2026-10-08
?
The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.European sourceENISA EUVD · EUVD-2026-94462
Product sourceVendor CSAF · Cisco PSIRT
Remediation sourceVendor CSAF · Cisco PSIRT
CWE sourceCNA
NVD statusNVD received
Core structured fields are present and their contributing authorities are shown above.
Material change intelligence
View recent updates ↗What changed after publication
- Vendor guidanceAuthoritative vendor guidance changed: removed patch: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR; removed remediation: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR.CNA ↗
- Before
- patch: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR · remediation: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR
- After
- no authoritative guidance recorded
- Remediation statusRemediation status changed from Mitigation available to Awaiting fix.CNA ↗
- Before
- Mitigation available
- After
- Awaiting fix
- Vendor guidanceAuthoritative vendor guidance changed: removed patch: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR; removed remediation: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR.CNA ↗
- Before
- patch: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR · remediation: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR
- After
- no authoritative guidance recorded
- Remediation statusRemediation status changed from Mitigation available to Awaiting fix.CNA ↗
- Before
- Mitigation available
- After
- Awaiting fix
- ENISA EUVD mappingEUVD-2026-94462 was added to the official ENISA EUVD mapping for this CVE.ENISA EUVD ↗
- Before
- not recorded
- After
- {"euvdId":"EUVD-2026-94462"}
- Vendor guidanceAuthoritative vendor guidance changed: removed patch: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR; removed remediation: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR.CNA ↗
- Before
- patch: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR · remediation: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR
- After
- no authoritative guidance recorded
- Vendor guidanceAuthoritative vendor guidance changed: removed patch: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR; removed remediation: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR.CNA ↗
- Before
- patch: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR · remediation: sec.cloudapps.cisco.com/cisco-sa-hardening-nxosw1-cWzSbtR
- After
- no authoritative guidance recorded
- Affected versionsThe structured affected or fixed version information changed.CNA ↗
- Before
- 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(5c); 15.2(5d); 16.0(1g); 15.2(5e); 15.2(4f); 15.2(6e); 16.0(1j); 15.2(6g); 15.2(7f); 15.2(7g); 16.0(2h); 15.2(6h); 15.2(8d); 16.0(2j); 15.2(8e); 16.0(3d); 15.2(8f); 16.0(3e); 15.2(8g); 15.3(1d); and 321 more · Fixed: The vendor publishes a fix, but no concise fixed-product list is available in this advisory.
- After
- Cisco NX-OS Software: 8.2(5), 7.3(5)D1(1), 8.4(2), 8.4(3), 9.2(3), 8.2(1), 7.3(1)D1(1), 9.2(2v), 7.3(0)D1(1), 7.3(4)D1(1), 9.2(1), 9.2(2t), 9.2(3y), 9.3(2), 7.3(1)DY(1), 8.1(1), 8.2(2), 8.3(2), 7.3(2)D1(3a), 9.2(4), 8.1(2), 7.3(3)D1(1), 8.2(3), 8.3(1), 8.4(1), 8.1(1b), 7.3(0)DX(1), 7.3(2)D1(1), 9.3(1), 7.3(2)D1(2), 8.2(4), 7.3(0)DY(1), 9.3(1z), 9.2(2), 8.1(2a), 7.3(2)D1(3), 8.1(1a), 8.4(1a), 9.3(3), 7.3(2)D1(1d), 9.3(4), 7.3(6)D1(1), 8.2(6), 9.3(5), 8.4(2a), 8.4(2b), 8.5(1), 9.3(6), 8.4(4), 7.3(7)D1(1), 8.4(2c), 9.3(5w), 8.2(7), 9.3(7), 9.3(7k), 7.3(8)D1(1), 9.3(7a), 8.2(7a), 9.3(8), 8.4(4a), 8.4(2d), 8.4(5), 8.2(8), 9.3(9), 7.3(9)D1(1), 8.4(6), 8.4(2e), 9.3(10), 9.2(1a), 8.2(9), 10.3(1), 8.4(7), 10.3(2), 8.4(6a), 9.3(11), 10.3(3), 9.4(1), 9.3(2a), 8.4(2f), 8.2(10), 9.3(12), 10.4(1), 8.4(8), 10.3(99w), 10.3(3w), 10.3(99x), 10.3(3o), 8.4(9), 10.3(4), 10.3(3p), 10.3(4a), 9.4(1a), 10.4(2), 10.3(3q), 9.3(13), 8.2(11), 9.4(2), 10.3(5), 10.4(3), 10.3(3x), 10.3(4g), 10.5(1), 8.4(10), 9.4(2a), 10.3(3r), 10.3(6), 9.3(14), 10.4(4), 10.3(4h), 10.5(2), 10.5(1j), 8.4(11), 9.4(3), 10.3(7), 10.4(5), 10.5(3), 9.3(15), 9.4(3a), 10.4(4g), 10.5(4), 9.4(3b), 8.4(12), 10.6(1), 10.5(3t), 10.3(8), 10.4(6), 10.5(3s), 10.5(3e), 9.4(4), 10.5(3o), 9.3(16), 10.6(1s), 10.6(2), 10.5(3p), 9.4(5), 10.3(9), 10.6(2s), 8.4(13), 10.6(3), 10.4(7), 10.5(5), 9.3(17), 10.6(2n), 10.6(3q), 10.6(3o), 10.6(3s); Cisco NX-OS System Software in ACI Mode: 15.2(1g), 15.2(2e), 15.2(2f), 15.2(2g), 15.2(2h), 15.2(3f), 15.2(3e), 15.2(3g), 15.2(4d), 15.2(4e), 15.2(5c), 15.2(5d), 16.0(1g), 15.2(5e), 15.2(4f), 15.2(6e), 15.2(6h), 16.0(1j), 15.2(6g), 15.2(7f), 15.2(7g), 16.0(2h), 15.2(8d), 16.0(2j), 15.2(8e), 16.0(3d), 16.0(3e), 15.2(8f), 15.2(8g), 15.3(1d), 15.2(8h), 16.0(4c), 15.3(2a), 15.2(8i), 16.0(5h), 15.3(2b), 16.0(3g), 16.0(5j), 15.3(2c), 16.0(6c), 15.3(2d), 16.1(1f), 16.0(7e), 16.0(8e), 15.3(2e), 16.0(8f), 16.1(2f), 16.1(2g), 15.3(2f), 16.0(9c), 16.1(3f), 16.0(9d), 16.0(6h), 16.0(8h), 16.1(3g), 16.0(9e), 16.1(4h), 16.1(5e), 16.2(1g), 16.0(9f), 16.2(2e); Cisco Unified Computing System (Managed): 4.0(1a), 4.1(1d), 4.0(4f), 4.0(4c), 4.0(2b), 4.1(2a), 4.0(4a), 4.0(4e), 4.0(4h), 4.0(2a), 4.1(1c), 4.0(1b), 4.1(1e), 4.0(4d), 4.0(4b), 4.0(2e), 4.1(1a), 4.0(4g), 4.0(1d), 4.0(1c), 4.0(4i), 4.0(2d), 4.1(1b), 4.1(2b), 4.0(4k), 4.1(3a), 4.1(3b), 4.1(2c), 4.0(4l), 4.1(4a), 4.1(3c), 4.1(3d), 4.2(1c), 4.2(1d), 4.0(4m), 4.1(3e), 4.2(1f), 4.1(3f), 4.2(1i), 4.1(3h), 4.2(1k), 4.2(1l), 4.0(4n), 4.2(1m), 4.1(3i), 4.2(2a), 4.2(1n), 4.1(3j), 4.2(2c), 4.2(2d), 4.2(3b), 4.1(3k), 4.0(4o), 4.2(2e), 4.2(3d), 4.2(3e), 4.2(3g), 4.1(3l), 4.3(2b), 4.2(3h), 4.2(3i), 4.3(2c), 4.1(3m), 4.3(2e), 4.3(3a), 4.2(3j), 4.3(3c), 4.3(4a), 4.2(3k), 4.3(4b), 4.3(4c), 4.2(3l), 4.3(4d), 4.3(2f), 4.2(3m), 4.3(5a), 4.3(4e), 4.1(3n), 4.3(4f), 4.2(3n), 4.3(5c), 4.2(3o), 4.3(5d), 4.3(6a), 4.3(6b), 4.3(5e), 4.3(6c), 4.2(3p), 6.0(1b), 6.0(1c), 4.3(6d), 6.0(1d), 6.0(1e), 4.3(6e), 6.0(1f), 4.3(6f), 6.0(2b), 6.0(1h), 4.2(3r), 6.0(2c), 4.3(6g), 6.0(2d), 4.3(6h), 4.2(3s), 4.3(6i) · Fixed: No fixed version is explicitly recorded in the structured CVE data.
- Remediation statusRemediation status changed from Mitigation available to Awaiting fix.CNA ↗
- Before
- Mitigation available
- After
- Awaiting fix
- CVSS scoreCVSS scoring authority changed from Other authority to CNA; the displayed base score remained 8.8.CNA ↗
- Before
- 8.8 (CVSS 3.1 · Other authority · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- After
- 8.8 (CVSS 3.1 · CNA · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- Affected versionsThe structured affected or fixed version information changed.Cisco PSIRT ↗
- Before
- 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(5c); 15.2(5d); 16.0(1g); 15.2(5e); 15.2(4f); 15.2(6e); 16.0(1j); 15.2(6g); 15.2(7f); 15.2(7g); 16.0(2h); 15.2(6h); 15.2(8d); 16.0(2j); 15.2(8e); 16.0(3d); 15.2(8f); 16.0(3e); 15.2(8g); 15.3(1d); and 321 more
- After
- 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(5c); 15.2(5d); 16.0(1g); 15.2(5e); 15.2(4f); 15.2(6e); 16.0(1j); 15.2(6g); 15.2(7f); 15.2(7g); 16.0(2h); 15.2(6h); 15.2(8d); 16.0(2j); 15.2(8e); 16.0(3d); 15.2(8f); 16.0(3e); 15.2(8g); 15.3(1d); and 320 more
- Remediation statusRemediation status changed from Awaiting fix to Mitigation available.Cisco PSIRT ↗
- Before
- Awaiting fix
- After
- Mitigation available
- Remediation statusRemediation status changed from Patch available to Mitigation available.Cisco PSIRT ↗
- Before
- Patch available
- After
- Mitigation available
- Catalogue recordCVE added to the BlackTree catalogue.Authoritative vendor CSAF advisory ↗
CVE published
Remediation guidance recorded
Technical terms and abbreviations used in this report
- CVE
- Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
- CVSS
- Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
- EPSS
- Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
- CWE
- Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
- CNA
- CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
- CISA ADP
- Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
- NVD
- National Vulnerability Database: NIST's enrichment service for CVE records.
- CERT / CSIRT
- A computer security incident response team that publishes warnings or coordinates incident response.
- PoC
- Proof of concept: public material that demonstrates or helps reproduce exploitation.
- CSAF
- Common Security Advisory Framework: a machine-readable format for security advisories.
- LoTL
- Living off the land: abuse of legitimate tools or system functions during an attack.