In PHP 8.3.* before 8.3.5, function mb_encode_mimeheader() runs endlessly for some inputs that contain long strings of non-space characters followed by a space. This could lead to a potential DoS attack if a hostile user sends data to an application that uses this function.
CVSS Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade php83 | Aug 22, 2024 | Apr 29, 2024 |
| Freebsd | — | Upgrade php82Upgrade php83Upgrade php81 | Dec 10, 2025 | Apr 16, 2024 |
| Gentoo Linux | — | Upgrade dev-lang/php. | Aug 13, 2024 | Apr 29, 2024 |
| Php | — | Upgrade to PHP version 8.3.5 | Feb 17, 2026 | Feb 17, 2026 |
| Suse | — | Upgrade php8-domUpgrade apache2-mod_php8Upgrade php8-gdUpgrade php8-pdoUpgrade php8-sqliteUpgrade php8-enchantUpgrade php8-sodiumUpgrade php8-bcmathUpgrade php8-bz2Upgrade php8-fastcgiUpgrade php8-gettextUpgrade php8-pharUpgrade php8-sysvsemUpgrade php8-readlineUpgrade php8-sysvshmUpgrade php8-mbstringUpgrade php8-pgsqlUpgrade php8-shmopUpgrade php8-ffiUpgrade php8-calendarUpgrade php8-intlUpgrade php8-exifUpgrade php8-iconvUpgrade php8-ctypeUpgrade php8Upgrade php8-zipUpgrade php8-embedUpgrade php8-dbaUpgrade php8-tokenizerUpgrade php8-soapUpgrade php8-ftpUpgrade php8-fpm-apacheUpgrade php8-posixUpgrade php8-fileinfoUpgrade php8-socketsUpgrade php8-opcacheUpgrade php8-develUpgrade php8-snmpUpgrade php8-ldapUpgrade php8-tidyUpgrade php8-opensslUpgrade php8-xmlreaderUpgrade php8-zlibUpgrade php8-sysvmsgUpgrade php8-mysqlUpgrade php8-xslUpgrade php8-xmlwriterUpgrade php8-pcntlUpgrade php8-fpmUpgrade php8-cliUpgrade php8-curlUpgrade php8-gmpUpgrade php8-odbc | Dec 5, 2025 | Dec 5, 2025 |
| Ubuntu | — | Upgrade php8.3 | Nov 19, 2024 | Apr 29, 2024 |
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