# CVE-2024-2757: libapache2-mod-php8.3: In PHP 8.3.* before 8.3.5, function mb_encode_mimeheader() runs endlessly for some inputs that contain long strings o...

CVE-2024-2757 is fixed in 34 products on 1 platform, first by libapache2-mod-php8.3 8.3.6-0maysync1, released April 28, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-2757
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0192
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 28, 2024

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libapache2-mod-php8.3 Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [libapache2-mod-php8.3 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libapache2-mod-php8.3-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | libphp8.3-embed Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [libphp8.3-embed 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libphp8.3-embed-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3 Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-bcmath Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-bcmath 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-bcmath-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-bz2 Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-bz2 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-bz2-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-cgi Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-cgi 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-cgi-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-cli Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-cli 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-cli-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-common Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-common 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-common-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-curl Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-curl 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-curl-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-dba Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-dba 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-dba-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-enchant Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-enchant 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-enchant-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-fpm Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-fpm 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-fpm-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-gd Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-gd 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-gd-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-gmp Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-gmp 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-gmp-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-imap Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-imap 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-imap-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-interbase Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-interbase 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-interbase-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-intl Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-intl 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-intl-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-ldap Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-ldap 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-ldap-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-mbstring Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-mbstring 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-mbstring-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-mysql Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-mysql 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-mysql-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-odbc Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-odbc 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-odbc-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-opcache Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-opcache 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-opcache-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-pgsql Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-pgsql 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-pgsql-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-phpdbg Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-phpdbg 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-phpdbg-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-pspell Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-pspell 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-pspell-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-readline Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-readline 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-readline-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-snmp Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-snmp 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-snmp-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-soap Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-soap 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-soap-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-sqlite3 Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-sqlite3 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-sqlite3-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-sybase Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-sybase 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-sybase-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-tidy Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-tidy 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-tidy-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-xml Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-xml 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-xml-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-xsl Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-xsl 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-xsl-8.3.6-0maysync1.md) | Apr 28, 2024 |
| Linux | php8.3-zip Ubuntu 24.04.5 LTS (noble) | 8.3.6-0maysync1 | [php8.3-zip 8.3.6-0maysync1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-php8.3-zip-8.3.6-0maysync1.md) | Apr 28, 2024 |

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