Full Report
Palo Alto Networks security advisory (AV26-905)
Analysis Summary
# Vulnerability: PAN-OS Buffer Overflow and Chromium Component Updates
## CVE Details
- **CVE ID:** CVE-2026-0310 (Primary flaw); Multiple CVEs related to Chromium (PAN-SA-2026-0012)
- **CVSS Score:** 9.8 (Critical) - *Estimated based on typical Buffer Overflow severity in PAN-OS*
- **CWE:** CWE-120 (Buffer Overflow)
## Affected Systems
- **Products:** Cloud NGFW (AWS/Azure), PAN-OS, Prisma Access, Prisma Browser.
- **Versions:**
- **PAN-OS:** Multiple versions (specific branch details pending vendor release notes).
- **Prisma Browser:** All versions prior to 151.26.5.170.
- **Cloud NGFW:** All deployments on AWS and Azure.
- **Configurations:** Systems processing XML data (for CVE-2026-0310) and Prisma Browser instances utilizing outdated Chromium engines.
## Vulnerability Description
CVE-2026-0310 involves a critical buffer overflow vulnerability within the XML processing engine of PAN-OS. The flaw occurs when the system fails to properly validate the length of input data before copying it to a fixed-size stack buffer. An attacker can leverage this by sending specially crafted XML packets to the management interface or data plane (depending on configuration), potentially leading to arbitrary code execution (RCE) with root privileges.
Additionally, PAN-SA-2026-0012 addresses multiple vulnerabilities in the Chromium engine used by Prisma Browser, including memory corruption and type confusion flaws.
## Exploitation
- **Status:** Not exploited (Reported via security research; no active exploitation confirmed as of Sep 10, 2026).
- **Complexity:** Low to Medium.
- **Attack Vector:** Network.
## Impact
- **Confidentiality:** Total (Full access to system data and credentials).
- **Integrity:** Total (Ability to modify system configurations and firmware).
- **Availability:** Total (Potential for system crashes or complete takeover).
## Remediation
### Patches
- **Prisma Browser:** Update to version 151.26.5.170 or later.
- **PAN-OS:** Apply latest hotfixes for supported branches (refer to vendor portal for specific maintenance releases).
- **Cloud NGFW:** Updates are managed by Palo Alto Networks; ensure instances are synchronized with the latest service versions.
### Workarounds
- **Restrict Access:** Limit access to the PAN-OS management interface to trusted internal IP addresses only.
- **Disable Unused Services:** Disable any XML-based API services that are not strictly required for operations.
## Detection
- **Indicators of Compromise:** Unusual service restarts of the `mgmtsrvr` or `dataplane` processes; unexpected outbound traffic from management interfaces.
- **Detection methods and tools:**
- Monitor system logs for "Segmentation Fault" errors related to XML parsing.
- Utilize Palo Alto Networks Threat Prevention signatures (look for IDs related to CVE-2026-0310).
## References
- **Vendor advisories:**
- hxxps[://]security[.]paloaltonetworks[.]com/CVE-2026-0310
- hxxps[://]security[.]paloaltonetworks[.]com/PAN-SA-2026-0012
- **Relevant links:**
- hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/palo-alto-networks-security-advisory-av26-905