Coverage › CVE-2026-0300
CVE-2026-0300 Unmapped
Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability
- Vendor / product
- Palo Alto Networks — PAN-OS
- Description (CISA)
- Palo Alto Networks PAN-OS contains an out-of-bounds write vulnerability in the User-ID Authentication Portal (aka Captive Portal) service that can allow an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets.
- Added to KEV
- 2026-05-06 — after the latest CTID mapping snapshot (2025-07-28)
- Due date
- 2026-05-09
- Required action
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Until the vendor releases an official fix, the following workaround should be implemented: - Restrict User-ID Authentication Portal access to only trusted zones. - Disable User-ID Authentication Portal if not required. 5/13/2026: Palo Alto has released a variety of patches. If these are relevant to your environment, please apply the designated patch.
- Known ransomware use
- Unknown
- CWE
- CWE-787
- CISA notes
- https://security.paloaltonetworks.com/CVE-2026-0300
https://nvd.nist.gov/vuln/detail/CVE-2026-0300 - Elsewhere
- cve.org · NVD · CISA KEV · JSON
ATT&CK techniques
No public source states how this vulnerability is exploited in ATT&CK terms.
The only authoritative CVE → ATT&CK mapping in the open — CTID's Mappings Explorer, pinned to a KEV snapshot of 2025-07-28 and ATT&CK 16.1 — does not include CVE-2026-0300. This entry was added to KEV on 2026-05-06, after that snapshot; of the 283 entries added since, 0 have a mapping. CISA's catalogue carries no technique field. kevmap does not infer techniques from the CWE (CWE-787) — here is why — and does not guess.
This page will change state automatically if a mapping is published. What is shown above is everything CISA publishes about the entry.