php security update (CVE-2026-109618)
Description
A critical remote code execution vulnerability (CVE-2026-109618) affects PHP versions prior to 8.3.36-1.oe2403sp1. The issue arises from improper handling of out-of-memory errors using longjmp(), which can leave request memory uninitialized and lead to use-after-free conditions. This flaw allows attackers to execute arbitrary code remotely. A patch is available to address this vulnerability.
CVSS v3.1
Score 9.8critical
Affected software
pkg:rpm/openEuler/php&distro=openEuler-24.03-LTS-SP1Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
PHP uses longjmp() to handle out-of-memory (OOM) errors by aborting the current request context. However, some contexts do not properly initialize request memory after such an event, causing subsequent cleanup procedures to read or branch on uninitialized memory. This can be triggered by multiple OOM strategies, resulting in remote code execution (RCE). Additionally, PHP's global state may temporarily point to request memory that is freed or not correctly reset, leading to stale references that can also be exploited for RCE. These issues are fixed in versions 8.3.36-1.oe2403sp1 and later.
Potential Impact
Successful exploitation of this vulnerability allows an unauthenticated remote attacker to execute arbitrary code on the affected system, potentially leading to full system compromise. The CVSS score of 9.8 reflects the critical nature of this flaw with high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
An official patch is available for this vulnerability. Users should upgrade PHP to version 8.3.36-1.oe2403sp1 or later to remediate the issue. No additional mitigations are specified by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- OESA-2026-4411
- Osv Schema Version
- 1.7.2
- Ecosystems
- ["openEuler:24.03-LTS-SP1"]
- Database Specific Severity
- Critical
- Cvss Version
- 3.1
Threat ID: 6ada44d44d27ba8daa6a4a99
Added to database: 10/22/2026, 17:16:04 UTC
Last enriched: 10/22/2026, 17:23:27 UTC
Last updated: 10/23/2026, 04:15:12 UTC
Views: 4
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