PHP Stale Internal Request-State Vulnerability
PHP has various global state that temporarily points into request memory. In some scenarios, global state may not be correctly reset, or may be repopulated after being reset. The global state may then refer to request memory even after it has been freed. Subsequent requests may read or branch on this stale state before it is fully initialized. Multiple strategies can trigger this condition and pro
What happened
PHP has various global state that temporarily points into request memory. In some scenarios, global state may not be correctly reset, or may be repopulated after being reset. The global state may then refer to request memory even after it has been freed. Subsequent requests may read or branch on this stale state before it is fully initialized. Multiple strategies can trigger this condition and produce remote code execution (RCE).
CISA lists it as exploited, added 26 Oct 2026.
Does it affect you
Names Palo Alto Networks PAN-OS. Enter the product and version you run to place it against the affected range the vendor published.
What to do
- Follow the vendor advisory for the fixed release and any interim mitigation.
github.com - Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
cisa.gov
CISA’s notes for this entry:
- This vulnerability affects an open-source component, third-party library, protocol, or proprietary implementation that could be used by different products. For more information, please see: php.net/
- cisa.gov/news-events/alerts/2026/10/21/critical-vulnerabilities-php-require-immediate-patching
- BOD 26-04: cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
- Forensics Triage Requirements: cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
- nvd.nist.gov/vuln/detail/CVE-2026-109619
Affected, as published to NVD
- panos
- Palo Alto Networks PAN-OS: exactly 12.2.4
The record
- NVD status
- Analyzed
- Published
- 21 Oct 2026, last modified 26 Oct 2026 (NVD)
- Severity
- CVSS 3.1 base score 8.1, High — computed here from the vector; NVD states 8.1.
- Vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness
- CWE-416 Use After Free, CWE-755 Improper Handling of Exceptional Conditions, CWE-824 Access of Uninitialized Pointer, CWE-1325 (NVD; names by MITRE)
- Exploitation
- Listed in CISA’s Known Exploited Vulnerabilities catalogue since 26 Oct 2026; federal remediation due 29 Oct 2026. CISA entry
- Exploit probability
- EPSS 100.0%, 100th percentile — FIRST, scored 26 Oct 2026. FIRST EPSS
- Vendor
- PHP Group · PHP (CISA)
References on the NVD record
- github.com/php/php-src/security/advisories/GHSA-6wmf-4rv5-p3rpMitigationVendor Advisory
- openwall.com/lists/oss-security/2026/10/21/16Mailing ListThird Party Advisory
- openwall.com/lists/oss-security/2026/10/21/17Mailing ListThird Party Advisory
- openwall.com/lists/oss-security/2026/10/21/23Mailing ListThird Party Advisory
- openwall.com/lists/oss-security/2026/10/21/7Mailing ListThird Party Advisory
- openwall.com/lists/oss-security/2026/10/22/14Mailing ListThird Party Advisory
- openwall.com/lists/oss-security/2026/10/22/15Mailing ListThird Party Advisory
- openwall.com/lists/oss-security/2026/10/22/16Mailing ListThird Party Advisory
- openwall.com/lists/oss-security/2026/10/22/19Mailing ListThird Party Advisory
- openwall.com/lists/oss-security/2026/10/22/2Mailing ListThird Party Advisory
- openwall.com/lists/oss-security/2026/10/22/20Mailing ListThird Party Advisory
- openwall.com/lists/oss-security/2026/10/23/4Mailing ListThird Party Advisory
- cert-portal.siemens.com/productcert/html/ssa-566512.htmlThird Party Advisory
- wiz.io/blog/php2shell-php-rceThird Party Advisory
Reporting that names this identifier
- CISA Adds Two Known Exploited Vulnerabilities to Catalog — CISA, 22 hr ago
- PHP2Shell security flaws now sucessfully exploited in the wild — BleepingComputer, 1 d ago
- PHP2Shell Exploitation Hits Government Entity Amid Global Scanning and Signs of AI-Assisted Hacking — The Hacker News, 2 d ago
- New PHP2Shell scanner checks your hosts for CVE-2026-109618 and CVE-2026-109619 — Help Net Security, 5 d ago
- PHP ships emergency patches for critical PHP2Shell flaws — BleepingComputer, 6 d ago
- PHP2Shell: Critical PHP vulnerabilities patched, update now! — Help Net Security, 6 d ago
- Critical Vulnerabilities in PHP Require Immediate Patching — CISA, 6 d ago
- PHP2Shell: Mass Exploitation Looms for Leaked Critical PHP Flaws — SecurityWeek, 6 d ago
Sources
The verdict above is computed from the products and versions you entered and the affected ranges the vendor published to NVD. It does not inspect your environment, and this site never reports a product as unaffected: why.