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High

RCE in Palo Alto Networks PAN-OS IKEv2 Processing

IdentifiersCVE-2026-0263CWE-120

CVE-2026-0263 is a buffer overflow vulnerability in the IKEv2 processing component of Palo Alto Networks PAN-OS. According to the provided content, an unauthenticated network-based attacker can trigger the flaw during IKEv2 VPN processing and achieve arbitrary code execution with elevated privileges on the firewall, or crash the affected service/device and cause a denial of service condition. The issue is specifically noted as being triggered when IKEv2 VPN tunnels are configured to use Post Quantum Cryptography (PQC) ciphers that are not NIST-approved. Panorama, Cloud NGFW, and Prisma Access are stated to be unaffected.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation can result in remote code execution on the firewall with elevated privileges, giving an attacker the ability to run arbitrary code in a highly privileged security appliance context. The vulnerability can also be used to cause a denial of service condition, potentially disrupting VPN functionality and firewall availability.

Mitigation

If you can’t patch tonight, do this now.

If immediate patching is not possible, reduce exposure by disabling or avoiding the vulnerable IKEv2 configuration path, specifically IKEv2 VPN tunnels configured with PQC ciphers that are not NIST-approved, as this is the stated trigger condition. Restrict network reachability to IKEv2 services to only trusted peers where operationally feasible, and monitor for anomalous IKEv2-related crashes or exploitation attempts until patches are applied.

Remediation

Patch, then assume compromise.

Apply the Palo Alto Networks PAN-OS security updates released for this issue on May 13, 2026. The provided content indicates affected PAN-OS branches include 12.1, 11.2, 11.1, and 10.2, and specifically notes that PAN-OS 12.1 versions prior to 12.1.4-h5 and prior to 12.1.7 are affected. Administrators should review the vendor advisory for the exact fixed versions applicable to each deployed branch and upgrade to the vendor-remediated release.
PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType
Palo Alto NetworksPan-Osoperating_system

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

11 SOURCESView more in app
What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.
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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity8

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES
MITRE CVE
cve.org · CVE-2026-0263
NVD
nvd.nist.gov/vuln/detail/CVE-2026-0263
MITRE CWE · CWE-120
cwe.mitre.org
security.paloaltonetworks.com
security.paloaltonetworks.com/CVE-2026-0263