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

Published May 13, 2026
·
Updated

A buffer overflow vulnerability in the DNS proxy and DNS Server features of Palo Alto Networks PAN-OS® Software allows an unauthenticated attacker with network access to cause a denial of service (DoS) condition (all PAN-OS platforms except Cloud NGFW and Prisma Access) or potentially execute arbitrary code by sending specially crafted network traffic (PA-Series hardware only).

Panorama, Cloud NGFW, and Prisma® Access are not impacted by this vulnerability.

Affected Software

177 affected componentsFixes available
Palo Alto Networks PAN-OS
Palo Alto Networks PAN-OS=12.1.0, =11.2.0, =11.1.0, =10.2.0
12.1.4-h512.1.711.2.4-h1711.2.7-h1311.2.10-h611.2.1211.1.4-h3311.1.6-h3211.1.7-h611.1.10-h2511.1.13-h511.1.1510.2.7-h3410.2.10-h3610.2.13-h2110.2.16-h710.2.18-h6
Palo Alto Networks Prisma Access
Palo Alto Networks PAN-OS<10.2.7
Palo Alto Networks PAN-OS>=10.2.8<10.2.10
Palo Alto Networks PAN-OS>=10.2.11<10.2.13
Palo Alto Networks PAN-OS>=10.2.14<10.2.16
Palo Alto Networks PAN-OS=10.2.7
Palo Alto Networks PAN-OS=10.2.7-h1
Palo Alto Networks PAN-OS=10.2.7-h10
Palo Alto Networks PAN-OS=10.2.7-h11
Palo Alto Networks PAN-OS=10.2.7-h12
Palo Alto Networks PAN-OS=10.2.7-h13
Palo Alto Networks PAN-OS=10.2.7-h14
Palo Alto Networks PAN-OS=10.2.7-h15
Palo Alto Networks PAN-OS=10.2.7-h16
Palo Alto Networks PAN-OS=10.2.7-h17
Palo Alto Networks PAN-OS=10.2.7-h18
Palo Alto Networks PAN-OS=10.2.7-h19
Palo Alto Networks PAN-OS=10.2.7-h2
Palo Alto Networks PAN-OS=10.2.7-h20
Palo Alto Networks PAN-OS=10.2.7-h21
Palo Alto Networks PAN-OS=10.2.7-h22
Palo Alto Networks PAN-OS=10.2.7-h23
Palo Alto Networks PAN-OS=10.2.7-h24
Palo Alto Networks PAN-OS=10.2.7-h3
Palo Alto Networks PAN-OS=10.2.7-h32
Palo Alto Networks PAN-OS=10.2.7-h4
Palo Alto Networks PAN-OS=10.2.7-h5
Palo Alto Networks PAN-OS=10.2.7-h6
Palo Alto Networks PAN-OS=10.2.7-h7
Palo Alto Networks PAN-OS=10.2.7-h8
Palo Alto Networks PAN-OS=10.2.7-h9
Palo Alto Networks PAN-OS=10.2.10
Palo Alto Networks PAN-OS=10.2.10-h1
Palo Alto Networks PAN-OS=10.2.10-h10
Palo Alto Networks PAN-OS=10.2.10-h11
Palo Alto Networks PAN-OS=10.2.10-h12
Palo Alto Networks PAN-OS=10.2.10-h13
Palo Alto Networks PAN-OS=10.2.10-h14
Palo Alto Networks PAN-OS=10.2.10-h17
Palo Alto Networks PAN-OS=10.2.10-h18
Palo Alto Networks PAN-OS=10.2.10-h2
Palo Alto Networks PAN-OS=10.2.10-h21
Palo Alto Networks PAN-OS=10.2.10-h27
Palo Alto Networks PAN-OS=10.2.10-h3
Palo Alto Networks PAN-OS=10.2.10-h30
Palo Alto Networks PAN-OS=10.2.10-h31
Palo Alto Networks PAN-OS=10.2.10-h36
Palo Alto Networks PAN-OS=10.2.10-h4
Palo Alto Networks PAN-OS=10.2.10-h5
Palo Alto Networks PAN-OS=10.2.10-h6
Palo Alto Networks PAN-OS=10.2.10-h7
Palo Alto Networks PAN-OS=10.2.10-h8
Palo Alto Networks PAN-OS=10.2.13
Palo Alto Networks PAN-OS=10.2.13-h1
Palo Alto Networks PAN-OS=10.2.13-h10
Palo Alto Networks PAN-OS=10.2.13-h15
Palo Alto Networks PAN-OS=10.2.13-h16
Palo Alto Networks PAN-OS=10.2.13-h18
Palo Alto Networks PAN-OS=10.2.13-h2
Palo Alto Networks PAN-OS=10.2.13-h3
Palo Alto Networks PAN-OS=10.2.13-h4
Palo Alto Networks PAN-OS=10.2.13-h5
Palo Alto Networks PAN-OS=10.2.13-h7
Palo Alto Networks PAN-OS=10.2.16
Palo Alto Networks PAN-OS=10.2.16-h1
Palo Alto Networks PAN-OS=10.2.16-h4
Palo Alto Networks PAN-OS=10.2.16-h6
Palo Alto Networks PAN-OS=10.2.17
Palo Alto Networks PAN-OS=10.2.18
Palo Alto Networks PAN-OS=10.2.18-h1
Palo Alto Networks PAN-OS=10.2.18-h5
Palo Alto Networks PAN-OS>=11.1.0<11.1.4
Palo Alto Networks PAN-OS>=11.1.5<11.1.6
Palo Alto Networks PAN-OS>=11.1.8<11.1.10
Palo Alto Networks PAN-OS>=11.1.11<11.1.13
Palo Alto Networks PAN-OS=11.1.4
Palo Alto Networks PAN-OS=11.1.4-h1
Palo Alto Networks PAN-OS=11.1.4-h10
Palo Alto Networks PAN-OS=11.1.4-h11
Palo Alto Networks PAN-OS=11.1.4-h12
Palo Alto Networks PAN-OS=11.1.4-h13
Palo Alto Networks PAN-OS=11.1.4-h15
Palo Alto Networks PAN-OS=11.1.4-h16
Palo Alto Networks PAN-OS=11.1.4-h17
Palo Alto Networks PAN-OS=11.1.4-h18
Palo Alto Networks PAN-OS=11.1.4-h2
Palo Alto Networks PAN-OS=11.1.4-h25
Palo Alto Networks PAN-OS=11.1.4-h27
Palo Alto Networks PAN-OS=11.1.4-h3
Palo Alto Networks PAN-OS=11.1.4-h32
Palo Alto Networks PAN-OS=11.1.4-h4
Palo Alto Networks PAN-OS=11.1.4-h5
Palo Alto Networks PAN-OS=11.1.4-h6
Palo Alto Networks PAN-OS=11.1.4-h7
Palo Alto Networks PAN-OS=11.1.4-h8
Palo Alto Networks PAN-OS=11.1.4-h9
Palo Alto Networks PAN-OS=11.1.6
Palo Alto Networks PAN-OS=11.1.6-h1
Palo Alto Networks PAN-OS=11.1.6-h10
Palo Alto Networks PAN-OS=11.1.6-h14
Palo Alto Networks PAN-OS=11.1.6-h17
Palo Alto Networks PAN-OS=11.1.6-h18
Palo Alto Networks PAN-OS=11.1.6-h19
Palo Alto Networks PAN-OS=11.1.6-h2
Palo Alto Networks PAN-OS=11.1.6-h20
Palo Alto Networks PAN-OS=11.1.6-h21
Palo Alto Networks PAN-OS=11.1.6-h22
Palo Alto Networks PAN-OS=11.1.6-h23
Palo Alto Networks PAN-OS=11.1.6-h25
Palo Alto Networks PAN-OS=11.1.6-h29
Palo Alto Networks PAN-OS=11.1.6-h3
Palo Alto Networks PAN-OS=11.1.6-h4
Palo Alto Networks PAN-OS=11.1.6-h5
Palo Alto Networks PAN-OS=11.1.6-h6
Palo Alto Networks PAN-OS=11.1.6-h7
Palo Alto Networks PAN-OS=11.1.7
Palo Alto Networks PAN-OS=11.1.7-h1
Palo Alto Networks PAN-OS=11.1.7-h2
Palo Alto Networks PAN-OS=11.1.7-h4
Palo Alto Networks PAN-OS=11.1.10
Palo Alto Networks PAN-OS=11.1.10-h1
Palo Alto Networks PAN-OS=11.1.10-h10
Palo Alto Networks PAN-OS=11.1.10-h12
Palo Alto Networks PAN-OS=11.1.10-h21
Palo Alto Networks PAN-OS=11.1.10-h4
Palo Alto Networks PAN-OS=11.1.10-h5
Palo Alto Networks PAN-OS=11.1.10-h7
Palo Alto Networks PAN-OS=11.1.10-h9
Palo Alto Networks PAN-OS=11.1.13
Palo Alto Networks PAN-OS=11.1.13-h1
Palo Alto Networks PAN-OS=11.1.13-h2
Palo Alto Networks PAN-OS=11.1.13-h3
Palo Alto Networks PAN-OS=11.1.14
Palo Alto Networks PAN-OS>=11.2.0<11.2.4
Palo Alto Networks PAN-OS>=11.2.5<11.2.7
Palo Alto Networks PAN-OS>=11.2.8<11.2.10
Palo Alto Networks PAN-OS=11.2.4
Palo Alto Networks PAN-OS=11.2.4-h1
Palo Alto Networks PAN-OS=11.2.4-h10
Palo Alto Networks PAN-OS=11.2.4-h11
Palo Alto Networks PAN-OS=11.2.4-h12
Palo Alto Networks PAN-OS=11.2.4-h14
Palo Alto Networks PAN-OS=11.2.4-h15
Palo Alto Networks PAN-OS=11.2.4-h2
Palo Alto Networks PAN-OS=11.2.4-h3
Palo Alto Networks PAN-OS=11.2.4-h4
Palo Alto Networks PAN-OS=11.2.4-h5
Palo Alto Networks PAN-OS=11.2.4-h6
Palo Alto Networks PAN-OS=11.2.4-h7
Palo Alto Networks PAN-OS=11.2.4-h8
Palo Alto Networks PAN-OS=11.2.4-h9
Palo Alto Networks PAN-OS=11.2.7
Palo Alto Networks PAN-OS=11.2.7-h1
Palo Alto Networks PAN-OS=11.2.7-h10
Palo Alto Networks PAN-OS=11.2.7-h11
Palo Alto Networks PAN-OS=11.2.7-h12
Palo Alto Networks PAN-OS=11.2.7-h2
Palo Alto Networks PAN-OS=11.2.7-h3
Palo Alto Networks PAN-OS=11.2.7-h4
Palo Alto Networks PAN-OS=11.2.7-h7
Palo Alto Networks PAN-OS=11.2.7-h8
Palo Alto Networks PAN-OS=11.2.10
Palo Alto Networks PAN-OS=11.2.10-h1
Palo Alto Networks PAN-OS=11.2.10-h2
Palo Alto Networks PAN-OS=11.2.10-h3
Palo Alto Networks PAN-OS=11.2.10-h4
Palo Alto Networks PAN-OS=11.2.10-h5
Palo Alto Networks PAN-OS=11.2.11
Palo Alto Networks PAN-OS>=12.1.0<12.1.4
Palo Alto Networks PAN-OS>=12.1.5<12.1.7
Palo Alto Networks PAN-OS=12.1.4
Palo Alto Networks PAN-OS=12.1.4-h2
Palo Alto Networks PAN-OS=12.1.4-h3
All of the following
Siemens Ruggedcom Ape1808 Firmware
Siemens Ruggedcom Ape1808

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 12.1.4-h5Fixed in 12.1.7Fixed in 11.2.4-h17Fixed in 11.2.7-h13Fixed in 11.2.10-h6Fixed in 11.2.12Fixed in 11.1.4-h33Fixed in 11.1.6-h32Fixed in 11.1.7-h6Fixed in 11.1.10-h25Fixed in 11.1.13-h5Fixed in 11.1.15Fixed in 10.2.7-h34Fixed in 10.2.10-h36Fixed in 10.2.13-h21Fixed in 10.2.16-h7Fixed in 10.2.18-h6
  2. Upgrade

    Upgrade PAN-OS 10.2 to a version that resolves this vulnerability.

    Fixed in 10.2.18-h6
  3. Upgrade

    Upgrade PAN-OS 11.1 to a version that resolves this vulnerability.

    Fixed in 11.1.15
  4. Upgrade

    Upgrade PAN-OS 11.2 to a version that resolves this vulnerability.

    Fixed in 11.2.12
  5. Upgrade

    Upgrade PAN-OS 12.1 to a version that resolves this vulnerability.

    Fixed in 12.1.7
  6. Configuration

    Disable the DNS Proxy feature (Network > DNS Proxy) if it is not being used.

    DNS Proxy (Network > DNS Proxy) DNS Proxy feature = disabled
  7. Configuration

    Disassociate DNS Proxy from externally accessible interfaces to reduce attack surface.

    DNS Proxy DNS Proxy binding/interface exposure = disassociated
  8. Compensating control

    If you have a Threat Prevention subscription, enable Threat ID 510027 from Applications and Threats content version 9100-10044 and later to block attacks for this vulnerability.

Event History

May 13, 2026
Advisory Published
via Palo Alto Networks·04:00 PM
Data Sourced
via Palo Alto Networks·04:00 PM
RemedyDescriptionSeverityWeaknessAffected Software
CVE Published
via MITRE·05:40 PM
Data Sourced
via MITRE·05:40 PM
DescriptionWeakness
Data Sourced
via NVD·06:16 PM
DescriptionSeverityWeaknessAffected Software
May 28, 2026
Advisory Published
via Palo Alto Networks·09:00 PM
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Frequently Asked Questions

1

What is the severity of CVE-2026-0264?

CVE-2026-0264 has a severity rating of HIGH.

2

How do I fix CVE-2026-0264?

To fix CVE-2026-0264, it is essential to apply the latest security updates provided by Palo Alto Networks for PAN-OS.

3

What does CVE-2026-0264 affect?

CVE-2026-0264 affects the DNS proxy and DNS Server features of Palo Alto Networks PAN-OS software.

4

Can CVE-2026-0264 be exploited remotely?

Yes, CVE-2026-0264 allows unauthenticated remote attackers to exploit the vulnerability.

5

What is a heap-based buffer overflow in the context of CVE-2026-0264?

In CVE-2026-0264, a heap-based buffer overflow occurs when the DNS Proxy or DNS Server improperly handles data, allowing code execution.

Company

Resources

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