Teachme Check is not affected by the PHP vulnerability (disclosed on 2026/10/20)

On 2026/10/20, the PHP development team announced that there are two critical vulnerabilities in PHP, and that a fixed version is scheduled to be released on 2026/10/21 at 23:00 (Japan Standard Time).

Is Teachme Check affected by these vulnerabilities?

No, it is not affected.
Neither Teachme Check nor any other service in the Teachme series uses PHP, so there is no impact from these vulnerabilities.

[Reference]
▼[Advance Notice] Upcoming PHP Security Release (External site)
https://www.ipa.go.jp/security/security-alert/2026/pre-alert20261021.html
▼Upcoming Critical PHP Security Release (External site)
https://www.php.net/archive/2026.php#2026-10-20-1