PAN-OS: Buffer Overflow Vulnerability via XML Processing (CVE-2026-0310) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-0310

PAN-OS: Buffer Overflow Vulnerability via XML Processing

Answer in brief

CVE-2026-0310 records a Unknown severity vulnerability in PAN-OS: Buffer Overflow Vulnerability via XML Processing. The current sources do not mark it as known exploited. The current feed maps Palo Alto Networks/Cloud NGFW (generic), Palo Alto Networks/PAN-OS (generic), Palo Alto Networks/Prisma Access (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 10, 2026Updated Sep 10, 2026Source checked Sep 10, 2026First seen by HOL Sep 10, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Palo Alto Networks/Cloud NGFW (generic), Palo Alto Networks/PAN-OS (generic), Palo Alto Networks/Prisma Access (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Palo Alto Networks/Cloud NGFWgeneric	All	Not reported
Palo Alto Networks/PAN-OSgeneric	>=12.2.0 <12.2.3 \|\| >=12.1.0 <12.1.4-h10 \|\| >=11.2.0 <11.2.4-h21 \|\| >=11.1.0 <11.1.4-h36 \|\| >=10.2.0 <10.2.7-h37	12.2.3, 12.1.4-h10, 11.2.4-h21, 11.1.4-h36, 10.2.7-h37
Palo Alto Networks/Prisma Accessgeneric	>=11.2.0 <11.2.4-h21 \|\| >=10.2.0 <10.2.7-h37	11.2.4-h21, 10.2.7-h37

Recommended response

Check inventory. Check lockfiles and deployed manifests for Palo Alto Networks/Cloud NGFW, Palo Alto Networks/PAN-OS, Palo Alto Networks/Prisma Access.
Review the reported fix. Update Palo Alto Networks/PAN-OS to 12.2.3; Palo Alto Networks/Prisma Access to 11.2.4-h21 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 10, 2026

Sources and claim methodology

Source referencesecurity.paloaltonetworks.com

Upstream source description

A buffer overflow vulnerability in the XML processing functionality of Palo Alto Networks PAN-OS® software enables an unauthenticated attacker with network access to the management web or dataplane interface to cause a denial of service (DoS) condition on VM-Series firewalls or execute arbitrary code with root privileges on the PA-Series firewalls. The security risk posed by this issue is minimized when the management interface is restricted to only trusted internal IP addresses according to our recommended best practice deployment guidelines https://live.paloaltonetworks.com/t5/community-blogs/tips-amp-tricks-how-to-secure-the-management-access-of-your-palo/ba-p/464431 . Panorama is impacted by this vulnerability.

Quoted source text, attributed separately from HOL analysis.