CRITICAL

CVE-2019-9025

CVSS v3

9.8

CRITICAL

EPSS Score

3.1 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

CVE-2019-9025 Red Hat Product Security
php: Negative size parameter in mb_split
ICSA-26-027-02 CISA1 known affected
Festo Didactic SE MES PC
Festo Didactic SE MES PC shipped with Windows 10

Full record on NVD

Description

An issue was discovered in PHP 7.3.x before 7.3.1. An invalid multibyte string supplied as an argument to the mb_split() function in ext/mbstring/php_mbregex.c can cause PHP to execute memcpy() with a negative argument, which could read and write past buffers allocated for the data.

Technical details

Published: 2019-02-22

Frequently asked questions

What is CVE-2019-9025?

Is CVE-2019-9025 actively exploited?

Active exploitation of CVE-2019-9025 has not been confirmed. Its EPSS score was 3.1% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-9025?

CVE-2019-9025 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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