Critical Memory corruption

CVE-2026-0263 — PAN-OS: Remote Code Execution (RCE) in IKEv2 Processing

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.

Published May 13, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: palo_alto

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.4% (30-day exploitation probability)+4
Technical severity (critical)+10

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.37%

ahead of 30% of scored CVEs · Oct 14, 2026

Affects

Palo Alto Networks

PAN-OS

CVSS base

9.8

Critical · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Total

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Palo Alto Networks PAN-OS).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Palo Alto Networks	PAN-OS	≥ 11.1.0 and < 11.1.4≥ 11.1.5 and < 11.1.6≥ 11.1.8 and < 11.1.10≥ 11.1.11 and < 11.1.13version 11.1.4version 11.1.4-h1version 11.1.4-h10version 11.1.4-h11 and 94 more version 11.1.4-h12version 11.1.4-h13version 11.1.4-h15version 11.1.4-h16version 11.1.4-h17version 11.1.4-h18version 11.1.4-h2version 11.1.4-h25version 11.1.4-h27version 11.1.4-h3version 11.1.4-h32version 11.1.4-h4version 11.1.4-h5version 11.1.4-h6version 11.1.4-h7version 11.1.4-h8version 11.1.4-h9version 11.1.6version 11.1.6-h1version 11.1.6-h10version 11.1.6-h14version 11.1.6-h17version 11.1.6-h18version 11.1.6-h19version 11.1.6-h2version 11.1.6-h20version 11.1.6-h21version 11.1.6-h22version 11.1.6-h23version 11.1.6-h25version 11.1.6-h29version 11.1.6-h3version 11.1.6-h4version 11.1.6-h5version 11.1.6-h6version 11.1.6-h7version 11.1.7version 11.1.7-h1version 11.1.7-h2version 11.1.7-h4version 11.1.10version 11.1.10-h1version 11.1.10-h10version 11.1.10-h12version 11.1.10-h21version 11.1.10-h4version 11.1.10-h5version 11.1.10-h7version 11.1.10-h9version 11.1.13version 11.1.13-h1version 11.1.13-h2version 11.1.13-h3version 11.1.14≥ 11.2.0 and < 11.2.4≥ 11.2.5 and < 11.2.7≥ 11.2.8 and < 11.2.10version 11.2.4version 11.2.4-h1version 11.2.4-h10version 11.2.4-h11version 11.2.4-h12version 11.2.4-h14version 11.2.4-h15version 11.2.4-h2version 11.2.4-h3version 11.2.4-h4version 11.2.4-h5version 11.2.4-h6version 11.2.4-h7version 11.2.4-h8version 11.2.4-h9version 11.2.7version 11.2.7-h1version 11.2.7-h10version 11.2.7-h11version 11.2.7-h12version 11.2.7-h2version 11.2.7-h3version 11.2.7-h4version 11.2.7-h7version 11.2.7-h8version 11.2.10version 11.2.10-h1version 11.2.10-h2version 11.2.10-h3version 11.2.10-h4version 11.2.10-h5version 11.2.11≥ 12.1.0 and < 12.1.4≥ 12.1.5 and < 12.1.7version 12.1.4version 12.1.4-h2version 12.1.4-h3	Vulnerable	NIST National Vulnerability Database
Palo Alto Networks	PAN-OS	≥ 12.1.0 and < 12.1.7, 12.1.4-h5≥ 11.2.0 and < 11.2.12, 11.2.10-h6, 11.2.7-h13, 11.2.4-h17≥ 11.1.0 and < 11.1.15, 11.1.13-h5, 11.1.10-h25, 11.1.7-h6, 11.1.6-h32, 11.1.4-h33	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
7.2	CVSS 4.0	High	—	—	psirt@paloaltonetworks.com via NIST National Vulnerability Database
7.2	CVSS 4.0	High	—	—	palo_alto via CVE Program (cve.org) e CISA ADP
9.8	CVSS 3.1	Critical	3.9	5.9	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-787 · Out-of-bounds Write

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.37%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.

web/proxy/WAF logsnetwork IDS/IPSendpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

2026
Affected products added · palo alto networks/pan-os
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 13, 2026
CVSS changed · 9.8
Oct 13, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 13, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 13, 2026 · NIST National Vulnerability Database
CVE published
May 13, 2026 · palo_alto

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

1 on the record

security.paloaltonetworks.com/CVE-2026-0263
Vendor Advisory, vendor-advisory, NIST National Vulnerability Database

Elsewhere on this site

Palo Alto Networks
every CVE for this vendor

Memory corruption
same class

CWE-787
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-0320 PAN-OS: Authenticated Admin Command Injection Vulnerability 22h
Medium CVE-2026-0319 PAN-OS: Improper Input Handling Vulnerability 22h
Medium CVE-2026-0318 PAN-OS: Denial of Service (DoS) on Panorama 22h
Low CVE-2026-0316 PAN-OS: Stored Cross-Site Scripting (XSS) Vulnerability 22h
Low CVE-2026-0317 PAN-OS: Denial of Service Vulnerability 22h
Medium CVE-2026-0321 PAN-OS: Denial of Service (DoS) Vulnerabilities in Network Services 23h

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-0263 is "PAN-OS: Remote Code Execution (RCE) in IKEv2 Processing", rated Critical. It affects PAN-OS (Palo Alto Networks); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 9.8 describes technical severity. EPSS 0.37% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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