CVEs / CVE-2026-109619

CVE-2026-109619: PHP Stale Internal Request-State Vulnerability

Known exploited in the CISA KEV catalog since 26 Oct 2026
high 8.1 CVSS 3.1 (NVD)
EPSS 99.9% chance of exploitation in the next 30 days, higher than 99% of CVEs (30 Oct 2026)
Last changed at its sources 30 Oct 2026

Are you affected? Check your servers with Stackurity: it lists the software on each server and the vulnerabilities to fix first.

Check your servers with Stackurity Already using Stackurity? Search for CVE-2026-109619

Summary

PHP contains a stale internal request-state vulnerability that allows for unauthenticated remote code execution.
CISA, Known Exploited Vulnerabilities catalog

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).
The CVE record, via NVD · published 21 Oct 2026 · NVD status: Undergoing Analysis

Affected and fixed versions

As stated by the CVE record (from the CNA)
Product	Affected	Fixed in
PHP Group PHP	from 8.2.*, before 8.2.35	8.2.35
PHP Group PHP	from 8.3.*, before 8.3.36	8.3.36
PHP Group PHP	from 8.4.*, before 8.4.27	8.4.27
PHP Group PHP	from 8.5.*, before 8.5.12	8.5.12
Siemens RUGGEDCOM APE1808	all versions	—
Siemens AMIS TS	all versions	—
Siemens blueplanet 360 NX3 M6 WM OD IISX	all versions	—
Siemens blueplanet 360 NX3 M6 WM OD IISX - S	all versions	—
Siemens Energy Engage V2.0SP9	all versions	—
Siemens Energy Engage V3.1SP1	all versions	—
Siemens Spectrum Power 3	all versions	—
Siemens Spectrum Power 4	all versions	—
Siemens Spectrum Power 7	all versions	—
Siemens Spectrum Power TG	all versions	—

Exploitation

In CISA KEV since	26 Oct 2026
Due date for US federal agencies	29 Oct 2026
Used in ransomware campaigns	Unknown
Required action	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.

Severity

CVSS 3.1	8.1 high `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H` Scored by NVD
Weakness	CWE-416, CWE-755, CWE-824, CWE-1325

On the Stackurity blog

Linux kernel flaw CVE-2026-46300 joins CISA's exploited list 29 Oct 2026
CISA adds two PHP remote code execution flaws to its KEV list 28 Oct 2026

References

CVE-2026-109619 on NVD
CVE-2026-109619 in the CISA KEV catalog
https://www.php.net/ (cited by CISA)
https://www.cisa.gov/news-events/alerts/2026/10/21/critical-vulnerabilities-php-require-immediate-patching (cited by CISA)
https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk (cited by CISA)
https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk (cited by CISA)
https://github.com/php/php-src/security/advisories/GHSA-6wmf-4rv5-p3rp Mitigation, Vendor Advisory
http://www.openwall.com/lists/oss-security/2026/10/21/16 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/21/17 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/21/23 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/21/7 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/22/14 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/22/15 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/22/16 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/22/19 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/22/2 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/22/20 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2026/10/23/4 Mailing 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-166980.html
https://cert-portal.siemens.com/productcert/html/ssa-566435.html
https://cert-portal.siemens.com/productcert/html/ssa-566512.html Third Party Advisory
https://php2shell.delftintellab.com/ Third Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-109619 US Government Resource
https://www.wiz.io/blog/php2shell-php-rce Third Party Advisory

Sources

Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.

This product uses data from the NVD API but is not endorsed or certified by the NVD.