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Known exploited vulnerability

CVE-2026-109618

criticalCVSS 4.0 9.2In CISA KEVEPSS 100%Published · PHP Group

The short answer

CVE-2026-109618 affects PHP Group PHP and is rated critical (CVSS 9.2). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-10-26: attackers are using it, so patch it first.

What it is

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).

Weakness: CWE-416, CWE-755, CWE-824, CWE-1325.

Severity

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/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

Exploited (CISA KEV)

Yes, since Oct 26, 2026

Federal due date Oct 29, 2026

EPSS, next 30 days

100%

Higher than 100% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
High
Attack requirements
Present
Privileges required
None
User interaction
None
Confidentiality impact
High
Integrity impact
High
Availability impact
High

What CISA says to do

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…

Affected products

PHP, AMIS TS, AX4, blueplanet 360 NX3 M6 WM OD IISX, blueplanet 360 NX3 M6 WM OD IISX - S, Building X, CADRA, Call stations, Capital, Chargesight, Climatix Cloud IC, Climatix Devices. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2026-109618 being exploited?

Yes. CISA added CVE-2026-109618 to its Known Exploited Vulnerabilities catalog on 2026-10-26, with a federal remediation due date of 2026-10-29.

How do I fix CVE-2026-109618?

CISA's 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…

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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