RCE via OOM corruption
Summary
| CVE | CVE-2026-109618 |
|---|---|
| State | PUBLISHED |
| Assigner | php |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-21 14:17:09 UTC |
| Updated | 2026-10-21 17:18:24 UTC |
| Description | 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). |
Risk And Classification
Primary CVSS: v4.0 9.2 CRITICAL from [email protected]
CVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Problem Types: CWE-416 | CWE-755 | CWE-824 | CWE-1325 | CWE-416 CWE-416 Use after free | CWE-755 CWE-755 Improper Handling of Exceptional Conditions | CWE-824 CWE-824 Access of uninitialized pointer | CWE-1325 CWE-1325 Improperly controlled sequential memory allocation | CWE-1419 CWE-1419 Incorrect Initialization of Resource
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 9.2 | CRITICAL | CVSS: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/C... |
| 4.0 | CNA | CVSS | 9.2 | CRITICAL | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| 3.1 | [email protected] | Primary | 9.8 | CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CVSS v4.0 Breakdown
CVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| www.wiz.io/blog/php2shell-php-rce | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | www.wiz.io | Third Party Advisory |
| github.com/php/php-src/security/advisories/GHSA-w8hw-w9fx-j79w | [email protected] | github.com | Mitigation, Vendor Advisory |
| www.openwall.com/lists/oss-security/2026/10/21/6 | af854a3a-2127-422b-91ae-364da2661108 | www.openwall.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Ryan at Calif.io (en)
CNA: Wiz (en)
CNA: OpenAI (en)
CNA: Arnaud Le Blanc (en)
CNA: Ilija Tovilo (en)
CNA: Jakub Zelenka (en)
CNA: Nora Dossche (en)
Additional Advisory Data
Workarounds
CNA: Check the GitHub Security Advisory for mitigation strategies.