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CVE-2026-0300CISA KEV

Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability

CISA lists this Palo Alto Networks PAN-OS vulnerability as known exploited. Check the cited references and original publisher guidance for affected products and remediation.

CISA KEVCISA-cited referenceNVD

CISA catalog record

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.

Product
PAN-OS
Added to KEV
6 May 2026
Federal remediation due
9 May 2026
Known ransomware use
Not reported
Page history

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Cite this version
Field-level log (4)

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  1. 29 Oct 2026 · 20:19:26 UTC Link: Vendor advisoryhttps://security.paloaltonetworks.com/CVE-2026-0300 → No longer listed in this observation
  2. 29 Oct 2026 · 20:19:26 UTC Link: CISA-cited referencehttps://security.paloaltonetworks.com/CVE-2026-0300
  3. 23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
  4. 23 Oct 2026 · 08:31:50 UTC Source coverage: cisa-kevCurrent → Incomplete

Explore global source statements, affected packages and advisory history for CVE-2026-0300. The catalog has a separate collection scope from Microsoft release records.

Explicit identifiers and source references

These records connect through source-stated identifiers. Shared identifiers or dates alone do not establish shared exposure, root cause or applicability.

CVE-2026-0300 · Microsoft / collected KEV context

cve-program · CVE-2026-0300

Related operational evidence

Explicit CVE identifiers
ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 9 Nov 19:13 UTC · 275 of 275 readable · 273 fully read · documentation 469/469 current

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