CVE-2026-0326
PAN-OS: Buffer Overflow Vulnerability in Protocol and Service Processing
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.
Fixes and workarounds
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_altoWorkaround
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_altoAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Cloud NGFW Palo Alto Networks |
All (affected, custom)
Other versions: unaffected |
CNA: palo_alto |
| PAN-OS Palo Alto Networks |
≥ 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 Other versions: unaffected |
CNA: palo_alto |
| Prisma Access Palo Alto Networks |
All (unaffected, custom)
Other versions: unaffected |
CNA: palo_alto |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 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 | CNA: palo_alto |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://security.paloaltonetworks.com/CVE-2026-0326CNA: palo_alto · vendor-advisory
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