--- id: CVE-2026-109618 title: RCE via OOM corruption summary: >- 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 performin… severity: critical cvss: 9.2 cvssVector: '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' cvssSource: cna cwe: - CWE-416 - CWE-755 - CWE-824 - CWE-1325 - CWE-1419 vendor: PHP Group product: php-src affected: - php-src >= 8.2.* < 8.2.35 - php-src >= 8.3.* < 8.3.36 - php-src >= 8.4.* < 8.4.27 - php-src >= 8.5.* < 8.5.12 ssvc: exploitation: active automatable: 'no' technicalImpact: total timestamp: '2026-10-27T12:15:42.707817Z' exploited: true exploitAvailable: true published: '2026-10-21' updated: '2026-10-27' sourceUpdated: '2026-10-27T12:58:23.360Z' source: CVEORG sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-109618' references: - url: 'https://github.com/php/php-src/security/advisories/GHSA-w8hw-w9fx-j79w' - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109618.json - url: 'https://access.redhat.com/security/cve/CVE-2026-109618' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2553995' - url: 'https://access.redhat.com/security/vulnerabilities/RHSB-2026-013' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-109618' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109618' - url: 'https://access.redhat.com/errata/RHSA-2026:88561' - url: 'https://access.redhat.com/errata/RHSA-2026:87070' - url: 'https://access.redhat.com/errata/RHSA-2026:87071' - url: 'https://access.redhat.com/errata/RHSA-2026:87080' - url: 'https://access.redhat.com/errata/RHSA-2026:87073' - url: 'https://access.redhat.com/errata/RHSA-2026:88565' - url: 'https://access.redhat.com/errata/RHSA-2026:88533' - url: 'https://access.redhat.com/errata/RHSA-2026:88532' - url: 'https://access.redhat.com/errata/RHSA-2026:88659' - url: 'https://access.redhat.com/errata/RHSA-2026:88835' - url: 'https://access.redhat.com/errata/RHSA-2026:88725' - url: 'https://access.redhat.com/errata/RHSA-2026:88834' - url: 'https://access.redhat.com/errata/RHSA-2026:88720' - url: 'https://access.redhat.com/errata/RHSA-2026:87072' - url: 'https://access.redhat.com/errata/RHSA-2026:87079' - url: 'https://access.redhat.com/errata/RHSA-2026:87151' - url: 'https://access.redhat.com/errata/RHSA-2026:87414' tags: - cve.org - in-the-wild - exploit-available - kev - csaf - vex - red-hat epss: 0.99999 epssPercentile: 0.99998 kev: true kevDateAdded: '2026-10-26' kevDueDate: '2026-10-29' kevRansomware: false exploits: exploitdb: true github: 700 githubRepos: - 'https://github.com/ikow/php2shell-poc' - 'https://github.com/eness/php2shell-CVE-2026-109618-CVE-2026-109619-PoC' - 'https://github.com/assetnote/php2shell-scanner' nuclei: - CVE-2026-109618 checkedAt: '2026-10-27T16:12:35.816Z' patched: - enterprise_linux_appstream_eus_v_10_0 - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_aus_v_8_4 - enterprise_linux_appstream_eus_extension_v_8_4 - enterprise_linux_appstream_aus_v_8_6 - enterprise_linux_appstream_eus_extension_v_8_6 - enterprise_linux_appstream_e4s_v_8_8 - enterprise_linux_appstream_tus_v_8_8 - enterprise_linux_appstream_e4s_v_9_2 - enterprise_linux_appstream_e4s_v_9_4 - enterprise_linux_appstream_eus_v_9_6 - enterprise_linux_appstream_v_9 - hardened_images scores: cna: 9.2 vendor: 8.1 ingestedAt: '2026-10-21T13:57:01.110Z' --- ## Overview 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). ## Affected - `php-src >= 8.2.* < 8.2.35` - `php-src >= 8.3.* < 8.3.36` - `php-src >= 8.4.* < 8.4.27` - `php-src >= 8.5.* < 8.5.12` ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ### Workarounds Check the GitHub Security Advisory for mitigation strategies. ## Vendor advisories - **RHSA-2026:88561** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0) · released 2026-10-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:88561) - **RHSA-2026:87070** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:87070) - **RHSA-2026:87071** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:87071) - **RHSA-2026:87080** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:87080) - **RHSA-2026:87073** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:87073) - **RHSA-2026:88565** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.4), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) · released 2026-10-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:88565) - **RHSA-2026:88533** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream AUS (v.8.6), Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) · released 2026-10-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:88533) - **RHSA-2026:88532** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.8.8), Red Hat Enterprise Linux AppStream TUS (v.8.8) · released 2026-10-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:88532) - **RHSA-2026:88659** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.2) · released 2026-10-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:88659) - **RHSA-2026:88835** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-10-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:88835) - **RHSA-2026:88725** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-10-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:88725) - **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 9, Red Hat OpenShift Dev Spaces · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 9, Red Hat OpenShift Dev Spaces · updated 2026-10-24 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-109618.json) - **RHSA-2026:87072** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:87072) - **RHSA-2026:87079** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:87079) - **RHSA-2026:87151** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:87151)