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CVE-2026-0288 — PAN-OS: Buffer Overflow Vulnerabilities in User-ID Terminal Server Agent

CVE-2026-0288 · PAN-OS · CVSS 7.5

In brief

Severity · CVSS
High7.5CVSS 3.1, High
EPSS
0.83%
CISA KEV
Not listed
Products
PAN-OS
Published · Modified
·
Last verified

Summary

Multiple buffer overflow vulnerabilities in the User-ID Terminal Server Agent (TSA) component of Palo Alto Networks PAN-OS software allow an unauthenticated attacker with network access to cause a denial of service (DoS) condition or potentially execute arbitrary code by sending specially crafted network traffic. The security risk posed by this issue is minimized when the User-ID Terminal Server Agent connectivity is restricted to only trusted internal IP addresses according to our recommended best practice deployment guidelines https://docs.paloaltonetworks.com/ngfw/help/10-2/user-identification/device-user-identification-terminal-services-agents#:~:text=To%20minimize%20security%20risk%2C%20restrict%20TS%20Agent%20connectivity%20to%20trusted%20internal%20IP%20addresses%20only. . Panorama is not impacted by this vulnerability.

Weakness: CWE-787

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

6 branches with a published fixed release

Palo Alto Networks PAN-OS

Source: CVE-2026-0288

  1. 12.1
    Affected versions>= 12.1.0, < 12.1.4-h8>= 12.1.5, < 12.1.7-h2
    First fixed release12.1.4-h812.1.7-h212.1.8
  2. 11.2Approaching end of support
    Affected versions>= 11.2.0, < 11.2.4-h20>= 11.2.5, < 11.2.7-h18>= 11.2.8, < 11.2.10-h12>= 11.2.11, < 11.2.13
    First fixed release11.2.4-h2011.2.7-h1811.2.10-h1211.2.13
  3. 11.1Approaching end of support
    Affected versions>= 11.1.0, < 11.1.4-h35>= 11.1.5, < 11.1.6-h35>= 11.1.7, < 11.1.7-h8>= 11.1.8, < 11.1.10-h30>= 11.1.11, < 11.1.13-h9>= 11.1.14, < 11.1.16
    First fixed release11.1.4-h3511.1.6-h3511.1.7-h811.1.10-h3011.1.13-h911.1.16
  4. 10.2End of life
    Affected versions>= 10.2.0, < 10.2.7-h36>= 10.2.8, < 10.2.10-h39>= 10.2.11, < 10.2.13-h23>= 10.2.14, < 10.2.16-h9>= 10.2.17, < 10.2.18-h8
    First fixed release10.2.7-h3610.2.10-h3910.2.13-h2310.2.16-h910.2.18-h8

Releases the vendor does not list are not affected.

Palo Alto Networks Prisma Access

Source: CVE-2026-0288

  1. 11.2
    Affected versions>= 11.2.0, < 11.2.7-h18
    First fixed release11.2.7-h18
  2. 10.2
    Affected versions>= 10.2.0, < 10.2.10-h39
    First fixed release10.2.10-h39

Releases the vendor does not list are not affected.

Remediation

Fix available

Vendor fix

  • PAN-OS 12.112.1.4-h8, 12.1.7-h2, 12.1.8
  • PAN-OS 11.211.2.4-h20, 11.2.7-h18, 11.2.10-h12, 11.2.13
  • PAN-OS 11.111.1.4-h35, 11.1.6-h35, 11.1.7-h8, 11.1.10-h30, 11.1.13-h9, 11.1.16
  • PAN-OS 10.210.2.7-h36, 10.2.10-h39, 10.2.13-h23, 10.2.16-h9, 10.2.18-h8
  • Prisma Access 11.211.2.7-h18
  • Prisma Access 10.210.2.10-h39

Upgrade to a fixed release listed above for your branch, or to a later fixed release the vendor explicitly supports.

Version Minor Version Suggested Solution Cloud NGFWNo action needed. PAN-OS 12.1 12.1.5 through 12.1.7-h* Upgrade to 12.1.7-h2 or 12.1.8 or later. 12.1.2 through 12.1.4-h* Upgrade to 12.1.4-h8 or 12.1.8 or later. PAN-OS 11.2 11.2.0 through 11.2.12 Upgrade to 11.2.13 or later.

Full text

11.2.0 through 11.2.10-h* Upgrade to 11.2.10-h12 or 11.2.13 or later. 11.2.0 through 11.2.7-h* Upgrade to 11.2.7-h18 or 11.2.13 or later. 11.2.0 through 11.2.4-h* Upgrade to 11.2.4-h20 or 11.2.13 or later. PAN-OS 11.1 11.1.0 through 11.1.15 Upgrade to 11.1.16 or later. 11.1.0 through 11.1.13-h* Upgrade to 11.1.13-h9 or 11.1.16 or later. 11.1.0 through 11.1.10-h* Upgrade to 11.1.10-h30 or 11.1.16 or later. 11.1.0 through 11.1.7-h* Upgrade to 11.1.7-h8 or 11.1.16 or later. 11.1.0 through 11.1.6-h* Upgrade to 11.1.6-h35 or 11.1.16 or later. 11.1.0 through 11.1.4-h* Upgrade to 11.1.4-h35 or 11.1.16 or later. PAN-OS 10.…

SourcePalo Alto Networks (CVE record)

Mitigation (vendor)

The vast majority of firewalls already follow Palo Alto Networks' and industry best practices. However, if you have not already, we strongly recommend that you restrict your User-ID Terminal Server Agent connectivity to only trusted internal IP addresses according to our best practice deployment guidelines

Full text

https://docs.paloaltonetworks.com/ngfw/help/10-2/user-identification/device-user-identification-terminal-services-agents#:~:text=To%20minimize%20security%20risk%2C%20restrict%20TS%20Agent%20connectivity%20to%20trusted%20internal%20IP%20addresses%20only.

SourcePalo Alto Networks (CVE record)

CERT-FR recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

SourceCERTFR-2026-AVI-0853

Vendor advisory

Sourcehttps://security.paloaltonetworks.com/CVE-2026-PAN-323400

Last verified 1 Oct 2026 at 09:32 UTC

Known exploitation

Not listed in CISA KEV as of the last check.

0.83% probability of exploitation in the next 30 days (percentile 56%).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CERT-FR

1 document of the French national CERT (ANSSI) references this CVE.

Advisory (AVI)CERTFR-2026-AVI-0853Published 9 Jul 2026

Multiple vulnerabilities in Palo Alto Networks products

Remote denial of serviceRemote cross-site scripting (XSS)Remote arbitrary code executionData integrity breachNot specified by the vendorServer-side request forgery (SSRF)Security policy bypassData confidentiality breachPrivilege escalation

Summary

Multiple vulnerabilities have been discovered in Palo Alto Networks products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation, and remote denial of service.

Recommendation

Refer to the vendor's security bulletin to obtain patches (see Documentation section).

Official document on cert.ssi.gouv.frread by Patcharo 28 Sept 2026 at 20:03 UTCMachine translation of the French text published by CERT-FR; a text whose translation did not pass Patcharo's checks stays in French. Identifiers, versions and links are copied unchanged.

Timeline

  1. Published by the source
  2. Source record last modified
  3. EPSS score computed
  4. Last verified by Patcharo

Official sources

References

Palo Alto Networks · NVD · FIRST EPSS

How Patcharo reads this

Affected and fixed releases come from the vendor's structured statements and are matched against exact versions; CVSS from NVD, exploitation from CISA KEV and the vendor's own advisory, probability from FIRST EPSS. Missing data stays Unknown and never becomes Not affected.

Read the methodologyRead the guide: PAN-OS versions explained: release lines, maintenance releases and the -h1, -h2, -h3 suffixes

Related vulnerabilities

Other records affecting the same products, newest first.

  • CVE-2026-0301PAN-OS: Information Disclosure Vulnerability in URL FilteringHigh
  • CVE-2026-0280PAN-OS: IPv6 Firewall Policy BypassHigh
  • CVE-2026-0281PAN-OS: Information Disclosure Vulnerability in Management Web InterfaceHigh
  • CVE-2026-0283PAN-OS: Authentication Bypass Vulnerability in Large Scale VPN (LSVPN)High
  • CVE-2026-0284PAN-OS: XML Injection Vulnerability in Large Scale VPN (LSVPN)Critical

All PAN-OS vulnerabilitiesAll Palo Alto Networks vulnerabilities