PAN-OS XML overflow can give unauth root on PA-Series
A buffer overflow in PAN-OS XML processing lets an unauthenticated attacker with network access to the management web or dataplane interface cause DoS on VM-Series or execute arbitrary code as root on PA-Series hardware firewalls. Upgrade to the fixed PAN-OS / Prisma Access builds for your train.
Also tracked as CVE-2026-0310 · PAN-OS XML buffer overflow
- First observed
- Sep 10, 2026
- Last observed
- Sep 10, 2026
- Last reviewed
- Sep 20, 2026
- Tracking ended
- Sep 10, 2026
Uncertainty and limitations
Read the evidence limits before acting on this record.
Cloud NGFW is listed as affected with no fixed version in the pack; confirm current Palo Alto guidance for Cloud NGFW separately from on-prem PAN-OS trains.
- Impact differs by platform: DoS on VM-Series vs arbitrary code as root on PA-Series hardware per vendor advisory.
- Cloud NGFW is listed affected without a pack fixed version — confirm live Palo Alto guidance.
- This campaign does not invent CVSS scores; severity is taken as critical from the unauth root/DoS impact described by the vendor.
Timeline
Reviewed events, oldest first, each tied to a verified source.
- Disclosure
Palo Alto Networks disclosed CVE-2026-0310 PAN-OS XML processing buffer overflow.
- Update
HOL Guard published operator blog coverage for CVE-2026-0310.
Publication clock: 254.6 hours from reviewed disclosure timestamp to HOL publication; 12-hour critical target; historical backfill outside target.
Guard coverage and non-coverage
What Guard's reviewed coverage assertions do and do not claim for this campaign.
No Guard coverage mapping is published for this record.
Defensive policy guidance
Reviewed starting points for defending against this campaign's artifact classes.
No campaign-specific policy guidance is published.
Reviewed artifacts and indicators
Published values are defanged (for example hxxps and [.] blocks) so nothing here is copy-paste executable.
Reviewed artifacts
The specific artifacts this record concerns, as reviewed. Names and versions are shown as text; a registry link is not recorded here.
PAN-OS@>=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-h37paloaltopackagePrisma Access@>=11.2.0 <11.2.4-h21 || >=10.2.0 <10.2.7-h37paloaltopackage
Sources
Every claim on this record is traceable to the sources below.
Reviewed in full by HOL Guard Security Publishing.
- Published
- Last full review
- Last modified
Record HGTC-2026-E824A93F.