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CVE-2026-0259 — WildFire WF-500 and WF-500-B: Arbitrary File Read and Delete Vulnerability in WildFire Appliance (WF-500, WF-500-B)

CVE-2026-0259 · Palo Alto Networks WildFire WF-500 and WF-500-B ·…

In brief

Severity · CVSS
High8.8CVSS 3.1, High
EPSS
0.34%
CISA KEV
Not listed
Published · Modified
·
Last verified

Summary

An arbitrary File Read and Delete Vulnerability in Palo Alto Networks WildFire® WF-500 and WF-500-B appliances enables users to read sensitive information and delete arbitrary files. This vulnerability affects WF-500 and WF-500-B appliances running in the default non-FIPS configuration mode. The WildFire Appliance (WF-500, WF-500-B) software update is now available to customers that use the WildFire Appliance (WF-500, WF-500-B) for on-premise sandboxing. Please note that customers using the WildFire Public cloud service are NOT impacted by this vulnerability.

Weakness: CWE-73

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.

4 branches with a published fixed release

Palo Alto Networks WildFire WF-500 and WF-500-B

Source: CVE-2026-0259

  1. 12.1
    Affected versions>= 12.1.0, < 12.1.4-h5>= 12.1.5, < 12.1.7
    First fixed release12.1.4-h512.1.7
  2. 11.2
    Affected versions>= 11.2.0, < 11.2.4-h17>= 11.2.5, < 11.2.7-h13>= 11.2.8, < 11.2.10-h6>= 11.2.11, < 11.2.12
    First fixed release11.2.4-h1711.2.7-h1311.2.10-h611.2.12
  3. 11.1
    Affected versions>= 11.1.0, < 11.1.4-h33>= 11.1.5, < 11.1.6-h32>= 11.1.7, < 11.1.7-h6>= 11.1.8, < 11.1.10-h25>= 11.1.11, < 11.1.13-h5>= 11.1.14, < 11.1.15
    First fixed release11.1.4-h3311.1.6-h3211.1.7-h611.1.10-h2511.1.13-h511.1.15
  4. 10.2
    Affected versions>= 10.2.0, < 10.2.7-h34>= 10.2.8, < 10.2.10-h36>= 10.2.11, < 10.2.13-h21>= 10.2.14, < 10.2.16-h7>= 10.2.17, < 10.2.18-h6
    First fixed release10.2.7-h3410.2.10-h3610.2.13-h2110.2.16-h710.2.18-h6

Releases the vendor does not list are not affected.

Remediation

Fix available

Vendor fix

  • WildFire WF-500 and WF-500-B 12.112.1.4-h5, 12.1.7
  • WildFire WF-500 and WF-500-B 11.211.2.4-h17, 11.2.7-h13, 11.2.10-h6, 11.2.12
  • WildFire WF-500 and WF-500-B 11.111.1.4-h33, 11.1.6-h32, 11.1.7-h6, 11.1.10-h25, 11.1.13-h5, 11.1.15
  • WildFire WF-500 and WF-500-B 10.210.2.7-h34, 10.2.10-h36, 10.2.13-h21, 10.2.16-h7, 10.2.18-h6

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

VERSION MINOR VERSION RANGE SUGGESTED SOLUTION WildFire WF-500 and WF-500-B 12.1 12.1.5 through 12.1.6 Upgrade to 12.1.7 or later. 12.1.2 through 12.1.4-h* Upgrade to 12.1.4-h5 or 12.1.7 or later. WildFire WF-500 and WF-500-B 11.2 11.2.11 or later Upgrade to 11.2.12 or later.

Full text

11.2.8 through 11.2.10-h* Upgrade to 11.2.10-h6 or 11.2.12 or later. 11.2.5 through 11.2.7-h* Upgrade to 11.2.7-h13 or 11.2.12 or later. 11.2.0 through 11.2.4-h* Upgrade to 11.2.4-h17 or 11.2.12 or later. WildFire WF-500 and WF-500-B 11.1 11.1.14 or later Upgrade to 11.1.15 or later. 11.1.11 through 11.1.13-h* Upgrade to 11.1.13-h5 or 11.1.15 or later. 11.1.8 through 11.1.10-h* Upgrade to 11.1.10-h25 or 11.1.15 or later. 11.1.7 through 11.1.7-h* Upgrade to 11.1.7-h6 or 11.1.15 or later. 11.1.5 through 11.1.6-h* Upgrade to 11.1.6-h32 or 11.1.15 or later. 11.1.0 through 11.1.4-h* Upgrade to 11.1.4-h33 or 11.1.15 or l…

SourcePalo Alto Networks (CVE record)

Mitigation (vendor)

For airgapped deployments, we strongly recommend that you secure WildFire 500 appliances by restricting access to only trusted internal IP addresses. Customers with a Threat Prevention subscription can block attacks for this vulnerability by enabling Threat ID 510010 (Applications and Threats content version 9100-10044 and later). Please note that this Threat ID requires SSL Decryption.

SourcePalo Alto Networks (CVE record)

CERT-FR recommendation

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

SourceCERTFR-2026-AVI-0596

Last verified 1 Oct 2026 at 09:32 UTC

Known exploitation

Not listed in CISA KEV as of the last check.

0.34% probability of exploitation in the next 30 days (percentile 24%).

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

CERT-FR

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

Advisory (AVI)CERTFR-2026-AVI-0596Published 15 May 2026

Multiple vulnerabilities in Palo Alto Networks products

Remote arbitrary code executionPrivilege escalationRemote denial of serviceData confidentiality breachData integrity breachSecurity policy bypassRemote cross-site scripting (XSS)Server-side request forgery (SSRF)SQL injection (SQLi)

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

Vendor advisory

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