--- title: "CVE-2026-7259\n | Ubuntu" description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/CVE-2026-7259?format=md keywords: index, follow --- # CVE-2026-7259 Publication date 10 May 2026 Last updated 5 June 2026 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) ## Cvss 3 Severity Score **6.5 · Medium** [Score breakdown](https://ubuntu.com/security/CVE-2026-7259?format=md#impact-score) Toggle side navigation ## Description In PHP versions 8.2.\* before 8.2.31, 8.3.\* before 8.3.31, 8.4.\* before 8.4.21, and 8.5.\* before 8.5.6, a mismatch between encoding lists in Oniguruma and mbfl leads to  a NULL pointer dereference, resulting in a segmentation fault and denial of service. The vulnerability is exploitable when user-controlled input can influence the encoding passed to mb\_regex\_encoding(). [Read the notes from the security team](https://ubuntu.com/security/CVE-2026-7259?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | php5 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Not in release | | 14.04 LTS trusty | Not affected | | php7.0 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Not in release | | 16.04 LTS xenial | Not affected | | php7.2 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Not in release | | 18.04 LTS bionic | Not affected | | php7.4 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Not in release | | 20.04 LTS focal | Not affected | | php8.1 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Fixed 8.1.2-1ubuntu2.24 | | php8.3 | 26.04 LTS resolute | Not in release | | 25.10 questing | Not in release | | 24.04 LTS noble | Fixed 8.3.6-0ubuntu0.24.04.9 | | 22.04 LTS jammy | Not in release | | php8.4 | 26.04 LTS resolute | Not in release | | 25.10 questing | Fixed 8.4.11-1ubuntu1.2 | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Not in release | | php8.5 | 26.04 LTS resolute | Fixed 8.5.4-0ubuntu1.1 | | 25.10 questing | Not in release | | 24.04 LTS noble | Not in release | | 22.04 LTS jammy | Not in release | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) * [Patch details](https://ubuntu.com/security/CVE-2026-7259?format=md#patch-details) ## Notes --- ### [sbeattie](https://launchpad.net/~sbeattie) PEAR issues should go against php-pear as of xenial --- ### [mdeslaur](https://launchpad.net/~mdeslaur) per Debian, introduced in 8.0.0RC2 with: https://github.com/php/php-src/commit/73455778d4ae35110a987f1019e548aff721c3af ### Patch details For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) | Package | Patch details | | --- | --- | | php8.5 | * Upstream: [79a054e](https://github.com/php/php-src/commit/79a054eae016c56409432e69aebc8ca908a88838) | ## Severity score breakdown CVSS version: CVSS v4.0 [CVSS v4.0](https://ubuntu.com/security/CVE-2026-7259?format=md) [CVSS v3.0](https://ubuntu.com/security/CVE-2026-7259?format=md) **Base score** 2.1 · Low * Base metrics | Parameter | Value | | --- | --- | | Attack vector | Network | | Attack complexity | High | | Attack requirements | Present | | Privileges required | None | | User interaction | Active | | Vulnerable system - Confidentiality impact | None | | Vulnerable system - Integrity impact | None | | Vulnerable system - Availability impact | Low | | Subsequent system - Confidentiality impact | None | | Subsequent system - Integrity impact | None | | Subsequent system - Availability impact | Low | * Scores | Parameter | Value | | --- | --- | | Base score | 2.1 · Low | | Base + Threat score | - | | Base + Environmental score | - | | Base + Threat + Environmental score | - | **Vector:** CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/U:Amber ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-7259) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-7259) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-7259) * [Debian](https://security-tracker.debian.org/tracker/CVE-2026-7259) ### Related Ubuntu Security Notices (USN) + [USN-8336-1](https://usn.ubuntu.com/USN-8336-1) + PHP vulnerabilities + 28 May 2026 ### Other references * *