CVE-2026-7259
Detail
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().
Metrics
NVD enrichment efforts reference publicly available information to associate
vector strings. CVSS information contributed by other sources is also
displayed.
CVSS 4.0 Severity and Vector Strings:
NVD assessment
not yet provided.
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
CVSS 3.x Severity and Vector Strings:
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0 Severity and Vector Strings:
Base
Score:
NVD assessment
not yet provided.
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Weakness Enumeration
| CWE-ID |
CWE Name |
Source |
|
CWE-476
|
NULL Pointer Dereference |
PHP Group
|
Change History
4 change records found show changes
CVE Modified by CISA-ADP
6/17/2026 7:02:06 AM
| Action |
Type |
Old Value |
New Value |
| Added |
SSVC |
{"timestamp":"2026-05-11T13:12:58.875843Z","id":"CVE-2026-7259","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}
|
CVE Modified by PHP Group
6/17/2026 7:02:06 AM
| Action |
Type |
Old Value |
New Value |
| Added |
Affected |
[{"vendor":"PHP Group","product":"PHP","defaultStatus":"affected","packageName":"mbstring","versions":[{"version":"8.2.*","lessThan":"8.2.31","versionType":"semver","status":"affected"},{"version":"8.3.*","lessThan":"8.3.31","versionType":"semver","status":"affected"},{"version":"8.4.*","lessThan":"8.4.21","versionType":"semver","status":"affected"},{"version":"8.5.*","lessThan":"8.5.6","versionType":"semver","status":"affected"}]}]
|
Initial Analysis by NIST
5/12/2026 1:40:38 PM
| Action |
Type |
Old Value |
New Value |
| Added |
CVSS V3.1 |
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
|
| Added |
CPE Configuration |
OR
*cpe:2.3:a:php:php:*:*:*:*:*:*:*:* versions from (including) 8.4.0 up to (excluding) 8.4.21
*cpe:2.3:a:php:php:*:*:*:*:*:*:*:* versions from (including) 8.5.0 up to (excluding) 8.5.6
*cpe:2.3:a:php:php:*:*:*:*:*:*:*:* versions from (including) 8.3.0 up to (excluding) 8.3.31
*cpe:2.3:a:php:php:*:*:*:*:*:*:*:* versions from (including) 8.2.0 up to (excluding) 8.2.31
|
| Added |
Reference Type |
PHP Group: https://github.com/php/php-src/security/advisories/GHSA-wm6j-2649-pv75 Types: Vendor Advisory
|
New CVE Received from PHP Group
5/10/2026 1:16:11 AM
| Action |
Type |
Old Value |
New Value |
| Added |
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().
|
| Added |
CVSS V4.0 |
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
|
| Added |
CWE |
CWE-476
|
| Added |
Reference |
https://github.com/php/php-src/security/advisories/GHSA-wm6j-2649-pv75
|
Quick Info
CVE Dictionary Entry: CVE-2026-7259 NVD
Published Date: 05/10/2026 NVD
Last Modified: 06/17/2026
Source: PHP Group
|
