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Home/Tech/PHP fixes two critical remote code execution flaws found with help from AI
VERIFIEDBy Xavier Rivera·Wednesday, October 21, 2026 at 10:44 AM EDT·1 min read

PHP fixes two critical remote code execution flaws found with help from AI

PHP released 8.2.35, 8.3.36, 8.4.27 and 8.5.12 on Oct 21 to fix two critical remote code execution flaws, CVE-2026-109618 and CVE-2026-109619. Both are rated 9.2 (CVSS 4.0), and the fixes were coordinated through OpenAI's Patch the Planet effort.

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PHP fixes two critical remote code execution flaws found with help from AI
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PHP fixed two critical remote code execution vulnerabilities on Oct 21 and is urging users to upgrade to PHP 8.2.35, 8.3.36, 8.4.27 or 8.5.12. All earlier versions are affected.

The flaws. According to PHP and NVD, CVE-2026-109618 (GHSA-w8hw-w9fx-j79w) allows remote code execution through out-of-memory corruption, where out-of-memory handling leaves request memory corrupted. CVE-2026-109619 (GHSA-6wmf-4rv5-p3rp) allows remote code execution through stale global state, a use-after-free of state left over between requests. Both are rated 9.2 (CVSS 4.0), Critical.

Who found them. Calif found a critical flaw using OpenAI's GPT-5.6 Sol, and Wiz independently found and reported both vulnerabilities. PHP's maintainers led the fixes, with OpenAI, Wiz, Cloudflare and others contributing as part of OpenAI's Patch the Planet effort, coordinated over the past two months. OpenAI also credits the White House Super Intelligence Force, ONCD, CISA and international partners.
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Why it matters. The bugs are in PHP itself, which OpenAI estimates runs about 70% of websites, so they matter whatever application runs on top.

Tools. OpenAI announced a PHP version checker to help operators spot vulnerable versions, and says an accompanying Codex skill is launching. It also announced $1 billion in subsidized Daybreak access.
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Sources: PHP ChangeLog, NVD, OpenAI
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