# CVE-2026-0326: PAN-OS: Buffer Overflow Vulnerability in Protocol and Service Processing

Status: published. Published: 2026-11-11. Updated: 2026-11-11.

A buffer overflow vulnerability in Palo Alto Networks PAN-OS software enables an unauthenticated attacker to disrupt service processing by causing a service process crash or memory corruption.



Panorama and Prisma® Access are not affected by this vulnerability.

## Remediation

- fix: VERSION           MINOR VERSION               SUGGESTED SOLUTION
Cloud NGFW                                    Customers who prefer to upgrade can work with Palo Alto
                                              Networks support to schedule an on-demand software upgrade.
PAN-OS 12.2       12.2.0 through 12.2.4-h*    Upgrade to 12.2.4-h2 or later.
PAN-OS 12.1       12.1.0 through 12.1.10-h*   Upgrade to 12.1.10-h4 or later.
PAN-OS 11.2       11.2.0 through 11.2.16-h*   Upgrade to 11.2.16-h2 or later.
PAN-OS 11.1       11.1.0 through 11.1.16-h*   Upgrade to 11.1.16-h5 or later.
All older                                     Upgrade to a supported fixed version.
unsupported
PAN-OS versions
Prisma Access                                 No action needed. (source: CNA: palo_alto)
- workaround: Customers can mitigate the risk of this issue by taking the following actions.

Detach the SCTP Protection profile from active Security Policy rules allowing SCTP traffic.

Disable configured DNS proxy objects:

 * Navigate to Network > DNS Proxy (https://docs.paloaltonetworks.com/ngfw/help/10-1/network/network-dns-proxy).

 * Click on each configured DNS Proxy object.

 * Uncheck the Enable checkbox.

 * Click OK and Commit the changes.

Update any active OSPFv3 Auth Profiles under Network > Network Profiles > OSPFv3 Auth (https://docs.paloaltonetworks.com/ngfw/networking/advanced-routing/create-ospfv3-routing-profiles)  to use standard cryptographic authentication other than ESP-NULL. (source: CNA: palo_alto)

## Affected products and versions

- Palo Alto Networks / Cloud NGFW: All (affected, custom). Source: CNA: palo_alto
- Palo Alto Networks / PAN-OS: ≥ 12.2.0; < 12.2.4-h2 (affected, custom); unaffected at 12.2.4-h2; ≥ 12.1.0; < 12.1.10-h4 (affected, custom); unaffected at 12.1.10-h4; ≥ 11.2.0; < 11.2.16-h2 (affected, custom); unaffected at 11.2.16-h2; ≥ 11.1.0; < 11.1.16-h5 (affected, custom); unaffected at 11.1.16-h5. Source: CNA: palo_alto
- Palo Alto Networks / Prisma Access: All (unaffected, custom). Source: CNA: palo_alto

## Severity and prioritization

- CVSS 4.0: 1.7 (low); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/AU:N/R:U/V:D/RE:M/U:Amber; source: CNA: palo_alto

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-787

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://security.paloaltonetworks.com/CVE-2026-0326 (CNA: palo_alto; vendor-advisory)

## Provenance

- CNA: palo_alto: https://www.cve.org/CVERecord?id=CVE-2026-0326; retrieved 2026-11-11; source updated 2026-11-11

Revision: 233df48115c1499852f99c49733bbdc39e97fcb607a93a34a062b867501a6385

Canonical: https://y2.dev/cve/CVE-2026-0326

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