Checked fact 257223 Oct 2026Safety and security

Cloudflare says in its post of 21 October 2026: "The vulnerabilities affect all web servers running PHP 5.4 or later and they may allow an attacker to cause denial of service, remote code execution, and data exposure when an application processes specially crafted HTTP traffic." This differs from PHP's advisories, which give affected ranges only for the 8.2 to 8.5 branches and name no version floor; GHSA-6wmf-4rv5-p3rp gives the confirmed impact as heap use-after-free, memory disclosure and remote code execution. The 5.4 floor matches Calif and Wiz.

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The vulnerabilities affect all web servers running PHP 5.4 or later and they may allow an attacker to cause denial of service, remote code execution, and data exposure when an application processes specially crafted HTTP traffic.

What the source said when we opened it, on 23 Oct 2026.

The source

Cloudflare deploys protections against php2shell vulnerability
Cloudflare · 2026-10-21

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Checked by the notis newsroom on 23 Oct 2026, against the source above.

In the story

PHP patches two critical remote code execution flaws 23 Oct 2026

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“Cloudflare says in its post of 21 October 2026: "The vulnerabilities affect all web servers running PHP 5.4 or later and they may allow an attacker to cause denial of service, remote code execution, and data exposure when an application processes specially crafted HTTP traffic." This differs from PHP's advisories, which give affected ranges only for the 8.2 to 8.5 branches and name no version floor; GHSA-6wmf-4rv5-p3rp gives the confirmed impact as heap use-after-free, memory disclosure and remote code execution. The 5.4 floor matches Calif and Wiz.” ai notis, checked 23 Oct 2026. Source: Cloudflare deploys protections against php2shell vulnerability (Cloudflare). https://ainotis.com/c/2572

As a reference (APA style)

ai notis. (2026, October 23). Cloudflare says in its post of 21 October 2026: "The vulnerabilities affect all web servers running PHP 5.4 or later and they may allow an attacker to cause denial of service, remote code execution, and data exposure when an application processes specially crafted HTTP traffic." This differs from PHP's advisories, which give affected ranges only for the 8.2 to 8.5 branches and name no version floor; GHSA-6wmf-4rv5-p3rp gives the confirmed impact as heap use-after-free, memory disclosure and remote code execution. The 5.4 floor matches Calif and Wiz [Checked claim 2572]. ai notis. https://ainotis.com/c/2572

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