critical severityConfidence highHistorical record

PAN-OS XML overflow can give unauth root on PA-Series

Direct answer

PAN-OS XML overflow can give unauth root on PA-Series, also tracked as CVE-2026-0310 / PAN-OS XML buffer overflow is a critical-severity threat campaign HOL Guard tracked from Sep 10, 2026 to Sep 10, 2026, verified against 3 primary sources and last reviewed Sep 20, 2026. Active tracking has ended and the record remains published as a permanent historical research record.

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

Record exports

JSON recordArtifact CSVSTIX 2.1 bundle

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.

Guard coverage and policy

What Guard's reviewed assertions do and do not claim for this campaign, and the reviewed starting points for defense.

No Guard coverage mapping or campaign-specific policy guidance is published for this record.

Safe next step. Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.

Open policy controlsCampaign-specific emergency policy starting point

Timeline

Reviewed events, oldest first, each tied to a verified source.

  1. Disclosure

    Palo Alto Networks disclosed CVE-2026-0310 PAN-OS XML processing buffer overflow.

    Sources:Palo Alto Networks security advisory CVE-2026-0310·NVD CVE-2026-0310

  2. Update

    HOL Guard published operator blog coverage for CVE-2026-0310.

    Source:HOL Guard operator write-up

Publication clock: 254.6 hours from reviewed disclosure timestamp to HOL publication; 12-hour critical target; historical backfill outside target.

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-h37paloaltopackage
  • Prisma 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.

Campaign questions, answered

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. HOL Guard tracked the campaign from Sep 10, 2026 to Sep 10, 2026.

No. Active tracking ended Sep 10, 2026; this page remains as a labeled historical research record and does not imply the threat is currently active.

The record cites 3 primary sources, names 2 reviewed artifacts, and was last fully reviewed Sep 20, 2026 by HOL Guard Security Publishing. Its uncertainty and limitations are stated on the record itself.

Campaign guidance is defensive context. It does not auto-apply policy or claim universal campaign coverage.

The permalink above is permanent. The full record can be downloaded from this page as JSON, an artifact CSV, and a STIX 2.1 bundle, and corrections can be requested through the published correction path on the 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.

Reviewed in full by HOL Guard Security Publishing.

Published
Last full review
Last modified

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Record HGTC-2026-E824A93F