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CVE-2026-109619

critical

Description

PHP has various global state that temporarily points into request memory. In some scenarios, global state may not be correctly reset, or may be repopulated after being reset. The global state may then refer to request memory even after it has been freed. Subsequent requests may read or branch on this stale state before it is fully initialized. Multiple strategies can trigger this condition and produce remote code execution (RCE).

References

https://php2shell.delftintellab.com/

https://github.com/php/php-src/security/advisories/GHSA-6wmf-4rv5-p3rp

https://cert-portal.siemens.com/productcert/html/ssa-566435.html

http://www.openwall.com/lists/oss-security/2026/10/23/4

http://www.openwall.com/lists/oss-security/2026/10/22/20

http://www.openwall.com/lists/oss-security/2026/10/22/2

http://www.openwall.com/lists/oss-security/2026/10/22/19

http://www.openwall.com/lists/oss-security/2026/10/22/16

http://www.openwall.com/lists/oss-security/2026/10/22/15

http://www.openwall.com/lists/oss-security/2026/10/22/14

http://www.openwall.com/lists/oss-security/2026/10/21/7

http://www.openwall.com/lists/oss-security/2026/10/21/23

http://www.openwall.com/lists/oss-security/2026/10/21/17

http://www.openwall.com/lists/oss-security/2026/10/21/16

https://hackread.com/insignary-releases-free-insignary-chk-tool-to-detect-php2shell-and-node2shell-exposure/

https://www.bleepingcomputer.com/news/security/cisa-warns-of-fragnesia-linux-flaw-chained-in-php2shell-attacks/

https://therecord.media/php2shell-successful-exploitation-reports-emerge

https://www.securityweek.com/china-linked-hackers-exploit-php2shell-to-root-firewalls/

https://thehackernews.com/2026/10/php2shell-attack-roots-25-servers.html

https://thehackernews.com/2026/10/attackers-exploit-php2shell-flaws-in.html

https://www.cisa.gov/news-events/alerts/2026/10/26/cisa-adds-two-known-exploited-vulnerabilities-catalog

https://www.bleepingcomputer.com/news/security/php2shell-security-flaws-now-sucessfully-exploited-in-the-wild/

https://www.securityweek.com/php2shell-patches-land-as-first-exploitation-attempts-hit-sensors/

https://aws.amazon.com/blogs/security/amazon-threat-intelligence-identifies-php2shell-exploitation-prior-to-public-disclosure-in-madpot/

https://kb.cert.org/vuls/id/763488

https://www.wsj.com/tech/cybersecurity/ai-just-found-a-bug-that-puts-up-to-70-of-the-worlds-websites-at-risk-fd0902ea

https://www.paloaltonetworks.com/blog/2026/10/millions-of-php-instances-exposed-what-organizations-need-to-do-right-now/

https://www.cisa.gov/news-events/alerts/2026/10/21/critical-vulnerabilities-php-require-immediate-patching

https://unit42.paloaltonetworks.com/cve-2026-109618-cve-2026-109619/

https://krebsonsecurity.com/2026/10/widespread-php-flaw-may-cause-many-site-outages-today/

https://www.bleepingcomputer.com/news/security/php-warns-admins-of-two-critical-flaws-emergency-patches-coming-tomorrow/

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-109619

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-107265

Details

Source: Mitre, NVD

Published: 2026-10-21

Updated: 2026-11-05

Named Vulnerability: php2shellNamed Vulnerability: PHP2shellNamed Vulnerability: PHP2ShellKnown Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 7.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.1

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: High

CVSS v4

Base Score: 9.2

Vector: 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

Severity: Critical

EPSS

EPSS: 0.99999

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Concern