pear pearweb up to 1.32.x preg_replace /e executable regular expression error

Summaryinfo

A vulnerability identified as critical has been detected in pear pearweb up to 1.32.x. Affected by this issue is the function preg_replace. This manipulation of the argument /e causes executable regular expression error. The identification of this vulnerability is CVE-2026-25237. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in pear pearweb up to 1.32.x. It has been declared as critical. Affected by this vulnerability is the function preg_replace. The manipulation of the argument /e with an unknown input leads to a executable regular expression error vulnerability. The CWE definition for the vulnerability is CWE-624. The product uses a regular expression that either (1) contains an executable component with user-controlled inputs, or (2) allows a user to enable execution by inserting pattern modifiers. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

PEAR is a framework and distribution system for reusable PHP components. Prior to version 1.33.0, use of preg_replace() with the /e modifier in bug update email handling can enable PHP code execution if attacker-controlled content reaches the evaluated replacement. This issue has been patched in version 1.33.0.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-25237 since 01/30/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 297928 (Linux Distros Unpatched Vulnerability : CVE-2026-25237), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.33.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (297928). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• pear

Name

• pearweb

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32

Website

• Product: https://github.com/pear/pearweb/

CPE 2.3info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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