MSRXCVE-2026-109618
CVE-2026-109618
PHP Memory Corruption Vulnerability
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.
CVSS 4.0 · CNA · php.net
chance of exploitation in the next 30 days (EPSS; in the top 1% of all CVEs)
PHP uses longjmp() for out-of-memory (OOM) errors to exit the current context and abort handling of the request. Some contexts may not properly account for this scenario and leave request memory in an uninitialized state before performing an allocation. The subsequent request cleanup procedure may read or branch on this memory. Multiple OOM strategies can consistently trigger this condition and lead to remote code execution (RCE).
Scores
Affected products
- php php: ≥ 7.3.0, < 8.2.35; ≥ 8.3.0, < 8.3.36; ≥ 8.4.0, < 8.4.27; ≥ 8.5.0, < 8.5.12
- siemens ruggedcom ape1808 firmware: all versions
- paloaltonetworks pan-os: ≥ 10.2.0, < 10.2.7; ≥ 11.1.0, < 11.1.4; ≥ 11.2.0, < 11.2.4; ≥ 12.1.0, < 12.1.4; ≥ 12.2.0, < 12.2.4; all versions; 285 specific releases listed in NVD
- paloaltonetworks panorama virtual appliance: all versions
Weakness: CWE-416, CWE-755, CWE-824, CWE-1325, CWE-1419
9 references (advisories, patches, write-ups)
- https://github.com/php/php-src/security/advisories/GHSA-w8hw-w9fx-j79w · Mitigation, Vendor Advisory
- http://seclists.org/fulldisclosure/2026/Oct/51
- http://www.openwall.com/lists/oss-security/2026/10/21/6 · Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/10/23/5 · 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-566512.html · Third Party Advisory
- https://php2shell.delftintellab.com · Third Party Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-109618 · US Government Resource
- https://www.wiz.io/blog/php2shell-php-rce · Third Party Advisory
Sources: NVD, CVE.org, FIRST EPSS. Missing ones did not answer or have no record yet.