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Vulnerabilities/CVE-2026-0263Public Intelligence Dossier
Source: paloaltonetworks · Limited verification•Last verified: •Collection Degraded
CVE-2026-0263Unknown / EvaluatingCRITICAL (raw)CVSS 9.8CWE-787

A buffer overflow vulnerability in the IKEv2 processing of Palo Alto Networks PAN-OS® software allows an unauthenticated network-based attacker to execute arbitrary code with elevated privileges on the firewall, or cause a denial of service (DoS) condition

Published: 13 May 2026•Last updated: 26 Oct 2026, 10:40 PM IST•Source identifier: psirt@paloaltonetworks.com
Dossier completeness: source-provided sections 2 / 3 · rule guidance available. Missing source facts count as incomplete.
Official source
CISA KEV catalog
Unknown
KEV status was not determined.
CVSS score
9.8CRITICAL (raw)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Metric sourcenvd@nist.gov
EPSS probability
0.4%0.004
Percentile31st
Weakness type
CWE-787
No further CWE recorded
Remediation
Patch status unknown
No fixed version or KB recorded

Why It Matters

Analysis dossier

Why It Matters

A buffer overflow vulnerability in the IKEv2 processing of Palo Alto Networks PAN-OS® software allows an unauthenticated network-based attacker to execute arbitrary code with elevated privileges on the firewall, or cause a denial of service (DoS) condition. Panorama, Cloud NGFW, and Prisma® Access are not impacted by these vulnerabilities.

SOC priority

High Severity / Review

Actively exploited (source statement)

Unknown

Publicly disclosed

Unknown

Risk basis: SOC ecosystem technology relevance; CRITICAL severity; Critical source severity without confirmed exploitation

Affected Products & Remediation

1 source-backed product
Affected products and versions (source)
  • paloaltonetworks pan-os · >= 11.1.0 < 11.1.4; >= 11.1.5 < 11.1.6; >= 11.1.8 < 11.1.10; >= 11.1.11 < 11.1.13; 11.1.4; 11.1.6; 11.1.7; 11.1.10; 11.1.13; 11.1.14; >= 11.2.0 < 11.2.4; >= 11.2.5 < 11.2.7; >= 11.2.8 < 11.2.10; 11.2.4; 11.2.7; 11.2.10; 11.2.11; >= 12.1.0 < 12.1.4; >= 12.1.5 < 12.1.7; 12.1.4 · NVD CPE · Source
Recorded patch / KBNot provided by source

Vendor or catalog guidance (source)

Not provided by source

Known exploitation (source facts)

Only what a source states. Unknown means no source has said either way; it is not "not exploited".

CISA KEV
Unknown
Exploited (source statement)
Unknown
Publicly disclosed (source)
Unknown

Suggested hunting (rule-based inference)

SecOps Signal recommendation (rule-based inference). These steps are hunting hypotheses from the vulnerability class; they do not state or imply that exploitation occurred here or anywhere.

Matched network-unauthenticated (CVSS AV:N, CVSS PR:N, CVSS UI:N)

Exposure

  1. Identify devices reporting this CVE and note which expose the affected service to untrusted networks.Telemetry: DeviceTvmSoftwareVulnerabilities · A network-reachable, no-privilege vector makes internet-facing instances the first exposure question. · Rule network-unauthenticated

Exploitation evidence

  1. Review inbound connections to the affected service from unexpected sources since the advisory date.Telemetry: DeviceNetworkEvents · Hunting hypothesis from the CVSS vector; it does not show that exploitation occurred. · Rule network-unauthenticated

Response

  1. Confirm the source-stated update is installed and the CVE is no longer reported.Telemetry: DeviceTvmSoftwareVulnerabilities · A follow-up inventory check verifies remediation. · Rule network-unauthenticated

CISA KEV Record

CISA KEV status was not determined for this record.

Change History & Source Data

— No recorded material change

CNA / source
psirt@paloaltonetworks.com
Record status · verification
UPDATED · NVD API
CPE
cpe:2.3:o:paloaltonetworks:pan-os:*:*:*:*:*:*:*:*, cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:-:*:*:*:*:*:*, cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h1:*:*:*:*:*:*, cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h10:*:*:*:*:*:*, cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h11:*:*:*:*:*:*, cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h12:*:*:*:*:*:*, cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h13:*:*:*:*:*:*, cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h15:*:*:*:*:*:*, cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h16:*:*:*:*:*:*, cpe:2.3:o:paloaltonetworks:pan-os:11.1.4:h17:*:*:*:*:*:*

Evidence & Provenance

2 public sources
security.paloaltonetworks.comSource recordnvd.nist.govSource record

Linked by the query's stored exact CVE association. Review required tables and validation status before use.

Detection Hunting Query
Target: DeviceTvmSoftwareVulnerabilities•Defender XDR
Detect endpoints exposed to CVE-2026-0263
Purpose: Exposure assessment (Category: Exposure Check)Why linked: Query metadata names CVE-2026-0263
DeviceTvmSoftwareVulnerabilities| where CveId == "CVE-2026-0263"| project DeviceId, DeviceName, OSPlatform, OSVersion, SoftwareVendor, SoftwareName, SoftwareVersion, CveId, VulnerabilitySeverityLevel, RecommendedSecurityUpdate, RecommendedSecurityUpdateId| sort by VulnerabilitySeverityLevel desc
Schema Checked · Not runtime validatedSource: SecOps Signal deterministic template · Limited verificationStatic screening: Passed structure and schema checks; tenant execution is not verified.
Open KQL Library

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Correlated briefings

SecOps Signal surfaces public advisory facts only. A missing value means the source has not published it, not that your environment is unaffected. No tenant inventory is connected.