Critical9.2Vendor: HighPalo Alto Networks

Critical [CVE-2026-0264] PAN-OS: Heap-Based Buffer Overflow in DNS Proxy and DNS Server Allows Unauthenticated Remote Code Execution

This critical-severity Palo Alto Networks advisory covers CVE-2026-0264 affecting PAN-OS.

CVE-2026-0264 Published May 28, 2026

CVE-2026-0264

Affected products & platforms

Palo Alto NetworksPAN-OSFirewallPAN-OS / Panorama

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Summary

CVE-2026-0264 PAN-OS: Heap-Based Buffer Overflow in DNS Proxy and DNS Server Allows Unauthenticated Remote Code Execution

Affected versions

PAN-OS 12.1: < 12.1.4-h5< 12.1.7
PAN-OS 11.2: < 11.2.4-h17< 11.2.7-h13< 11.2.10-h6< 11.2.12
PAN-OS 11.1: < 11.1.4-h33< 11.1.6-h32< 11.1.7-h6< 11.1.10-h25< 11.1.13-h5< 11.1.15
PAN-OS 10.2: < 10.2.7-h34< 10.2.10-h36< 10.2.13-h21< 10.2.16-h7< 10.2.18-h6

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

PAN-OS >= 12.1.4-h5
PAN-OS >= 12.1.7
PAN-OS >= 11.2.4-h17
PAN-OS >= 11.2.7-h13
PAN-OS >= 11.2.10-h6
PAN-OS >= 11.2.12
PAN-OS >= 11.1.4-h33
PAN-OS >= 11.1.6-h32
PAN-OS >= 11.1.7-h6
PAN-OS >= 11.1.10-h25
PAN-OS >= 11.1.13-h5
PAN-OS >= 11.1.15
PAN-OS >= 10.2.7-h34
PAN-OS >= 10.2.10-h36
PAN-OS >= 10.2.13-h21
PAN-OS >= 10.2.16-h7
PAN-OS >= 10.2.18-h6

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

All older unsupported PAN-OS versions Upgrade to a supported fixed version.

Temporary workarounds

Customers can mitigate the risk of this issue by taking either of the following actions:Action 1:
Disassociate DNS Proxy from externally accessible interfaces in order to reduce your attack surface; ANDConfigure DNS server with a RFC1918 or a public trusted IP address.
Disable the DNS Proxy feature (Network > DNS Proxy) if it is not being used; ANDConfigure DNS server with a RFC1918 or a public trusted IP address.
Customers with a Threat Prevention subscription can block attacks for this vulnerability by enabling Threat ID 510027 from Applications and Threats content version 9100-10044 and later.

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Palo Alto Networks Security Advisoriesofficial
Official vendor feed — the source of truth for this advisory. VulniPulse polled this feed and parsed this entry from it. Discovered from the machine-readable feed https://security.paloaltonetworks.com/rss.xml; this link opens the Palo Alto Networks advisory index instead of the raw feed document.
Palo Alto Networks
Vendor advisory pageofficial
Advisory page fetched and parsed to extract affected/fixed versions and mitigation guidance beyond what the feed carries.
Palo Alto Networks
CVE.org CNA affected-product recordCVE.org
Structured CNA affected[] data independently confirmed the affected product scope; native advisory content remains authoritative.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-0264NVD CVE.org MITRE

Official resources

PAN-OS / Panorama upgrade guide (target: 12.1.4-h5 / 12.1.7 / 11.2.4-h17)
Official documentation
This advisory names 12.1.4-h5 / 12.1.7 / 11.2.4-h17 as the first fixed releases — official upgrade documentation for PAN-OS firewalls and Panorama.
Palo Alto Networks Security Advisories portal
Official documentation
Canonical advisory portal — check here for the latest revision of this advisory and affected-version updates.

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