CVE-2026-7259
published 2026-05-10CVE-2026-7259: 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…
PriorityP430medium6.5CVSS 3.1
AVNACLPRNUIRSUCNINAH
EPSS
0.20%
10.2th percentile
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().
Affected
17 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | php8.4 | — | — |
| php | php | — | — |
| php | php | >= 8.2.0 < 8.2.31 | 8.2.31 |
| php | php | >= 8.3.0 < 8.3.31 | 8.3.31 |
| php | php | >= 8.4.0 < 8.4.21 | 8.4.21 |
| php | php | >= 8.5.0 < 8.5.6 | 8.5.6 |
| php_7.4 | php | — | — |
| php_8.2 | php | — | — |
| php_8.3 | php | — | — |
| php_group | php | >= 8.2.* < 8.2.31 | 8.2.31 |
| php_group | php | >= 8.3.* < 8.3.31 | 8.3.31 |
| php_group | php | >= 8.4.* < 8.4.21 | 8.4.21 |
| php_group | php | >= 8.5.* < 8.5.6 | 8.5.6 |
| ubuntu | php8.1 | — | — |
| ubuntu | php8.3 | — | — |
| ubuntu | php8.4 | — | — |
| ubuntu | php8.5 | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
nvdv4.02.1LOWCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:Amber
vendor_ubuntu7.4HIGH
vendor_redhat2.1LOW
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Ubuntu
PHP vulnerabilities
vendor_ubuntu·2026-05-28·CVSS 7.4
CVE-2026-7259 [HIGH] PHP vulnerabilities
Title: PHP vulnerabilities
Summary: Several security issues were fixed in PHP.
Aleksey Solovev and Nikita Sveshnikov discovered that PHP improperly
handled NUL bytes when preparing SQL queries in the PDO Firebird driver. An
attacker could possibly use this issue to perform SQL injection attacks.
(CVE-2025-14179)
It was discovered that PHP incorrectly handled certain encoding names in
mbstring. An attacker could possibly use this issue to obtain sensitive
information or cause a denial of service. This issue only affected Ubuntu
25.10 and Ubuntu 26.04 LTS. (CVE-2026-6104)
It was discovered that PHP incorrectly handled object references while
parsing crafted SOAP requests. A remote attacker could possibly use this
issue to execute arbitrary code. (CVE-2026-6722)
It was discovered that PH
Red Hat
php: NULL pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()
vendor_redhat·2026-05-10·CVSS 2.1
CVE-2026-7259 [LOW] CWE-476 php: NULL pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()
php: NULL pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()
A flaw was found in PHP. When an attacker input can influence the encoding passed to `mb_regex_encoding()` and the application subsequently uses mbregex search APIs, a NULL pointer dereference can occur due to a mismatch between the Oniguruma and mbfl encoding support. This issue can cause a crash in the PHP process, resulting in a denial of service.
Statement: To exploit this issue, an attacker needs to be able to influence the encoding passed to `mb_regex_encoding()` in a way that triggers a mismatch between the Oniguruma and mbfl encoding support. Also, the application must use the mbregex search APIs, allowing the attacker to cause a NULL pointer dereference. Due to these reasons, this flaw has been ra
VulDB
PHP up to 8.2.30/8.3.30/8.4.20/8.5.5 mb_regex_encoding null pointer dereference (GHSA-wm6j-2649-pv75 / WID-SEC-2026-1433)
vuldb·2026-05-10·CVSS 2.1
CVE-2026-7259 [LOW] PHP up to 8.2.30/8.3.30/8.4.20/8.5.5 mb_regex_encoding null pointer dereference (GHSA-wm6j-2649-pv75 / WID-SEC-2026-1433)
A vulnerability was found in PHP up to 8.2.30/8.3.30/8.4.20/8.5.5. It has been rated as problematic. This impacts the function mb_regex_encoding. Performing a manipulation results in null pointer dereference.
This vulnerability is identified as CVE-2026-7259. The attack can be initiated remotely. There is not any exploit available.
Upgrading the affected component is advised.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-7259 php: NULL pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()
bugzilla·2026-05-10·CVSS 2.1
CVE-2026-7259 [LOW] CVE-2026-7259 php: NULL pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()
CVE-2026-7259 php: NULL pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()
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().
Rapid7
Patch Tuesday - May 2026
blogs_rapid7·2026-05-13·CVSS 10.0
CVE-2026-41089 [CRITICAL] Patch Tuesday - May 2026
Microsoft is publishing 137 vulnerabilities on May 2026 Patch Tuesday . Microsoft is not aware of exploitation in the wild or public disclosure for any of these vulnerabilities. So far this month, Microsoft has provided patches to address 133 browser vulnerabilities, which are not included in the Patch Tuesday count above.
## Windows Netlogon: critical RCE
Anyone responsible for securing a domain controller should prioritize remediation of CVE-2026-41089 , which is a critical stack-based buffer overflow in Windows Netlogon with a CVSS v3 base score of 9.8. Exploitation leads to execution in the context of the Netlogon service, so that’s SYSTEM privileges on the domain controller. For most pentesters, that’s the point at which the customer report more or less writes itself. No privileges
2026-05-10
Published