CVE-2026-109619
PHP Stale Internal Request-State Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 29 October 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
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).
- CVSS 4.0
- 9.2 CRITICALCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 100.00% probability · 100th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Listed 26 October 2026 · due 29 October 2026
- Weakness
- CWE-416, CWE-755, CWE-824, CWE-1325
- Affected
- php/php · siemens/ruggedcom ape1808 firmware · paloaltonetworks/pan-os · paloaltonetworks/panorama virtual appliance
- Source
- security@php.net
EPSS moved from 5.8% on 22 October 2026 to 100.0% on 26 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.
CISA notes
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. 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: https://www.php.net/ ; https://www.cisa.gov/news-events/alerts/2026/10/21/critical-vulnerabilities-php-require-immediate-patching ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-109619
References
- https://github.com/php/php-src/security/advisories/GHSA-6wmf-4rv5-p3rpMitigation, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2026/10/21/16Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/21/17Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/21/23Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/21/7Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/22/14Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/22/15Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/22/16Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/22/19Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/22/2Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/22/20Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/23/4Mailing List, Third Party Advisory
- https://arcticwolf.com/resources/blog/php2shell-critical-php-vulnerabilities-enable-unauthenticated-remote-code-execution/Third Party Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-566512.htmlThird Party Advisory
- https://php2shell.delftintellab.com/Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-109619US Government Resource
- https://www.wiz.io/blog/php2shell-php-rceThird Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.