This report was translated by AI; nobody has reviewed the translation yet. Original language: Czech.

[TLP:CLEAR] Palo Alto PAN-OS fixes 8 vulnerabilities

Palo Alto fixes 8 vulnerabilities in PAN-OS (PA-Series and VM-Series firewalls). The most severe vulnerabilities are described below; the rest can be found at [1]. Some of the fixes are expected to be released on 28 May 2026, see [1]. Fixed versions of the product: 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

Palo Alto Networks PAN-OS - authentication bypass (CVE-2026-0265)
CVSS 7.2 (High)

An unauthenticated remote attacker can bypass authentication checks when the Cloud Authentication Service (CAS) is enabled, particularly when CAS is enabled on the management interface [2].

The vulnerability is present in product:

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

CVSS: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/AU:N/R:U/V:D/RE:M/U:Red

More information:

The vulnerability was publicly disclosed 13. 5. 2026.

Palo Alto Networks PAN-OS - RCE (CVE-2026-0264)
CVSS 7.2 (High)

An unauthenticated remote attacker can carry out a DoS attack or potentially execute arbitrary code by sending specially crafted network traffic, due to a buffer overflow vulnerability in the DNS Proxy and DNS Server features [3].

The vulnerability is present in product:

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

CVSS: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:U/AU:Y/R:U/V:C/RE:H/U:Red

More information:

The vulnerability was publicly disclosed 13. 5. 2026.

Palo Alto Networks PAN-OS - RCE (CVE-2026-0263)
CVSS 7.2 (High)

An unauthenticated remote attacker can carry out a DoS attack or execute arbitrary code with elevated privileges on the firewall due to a buffer overflow vulnerability in the processing of the IKEv2 protocol [4].

The vulnerability is present in product:

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

CVSS: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:N/E:U/AU:Y/R:U/V:C/RE:H/U:Red

More information:

The vulnerability was publicly disclosed 13. 5. 2026.

By CESNET, z.s.p.o. Michaela Jarošová on 19. 5. 2026.

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