CVE-2026-4746
Received Received - Intake
Out-of-Bounds Write in timeplus-io proton inflate.C Module

Publication date: 2026-03-24

Last updated on: 2026-03-24

Assigner: Government Technology Agency of Singapore Cyber Security Group (GovTech CSG)

Description
Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is associated with program files inflate.C. This issue affects proton: before 1.6.16.
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Meta Information
Published
2026-03-24
Last Modified
2026-03-24
Generated
2026-06-16
AI Q&A
2026-03-24
EPSS Evaluated
2026-06-15
NVD
CVE-2026-4746
EUVD
EUVD-2026-14745
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
timeplus-io proton to 1.6.16 (exc)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.
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Executive Summary

CVE-2026-4746 is an out-of-bounds write vulnerability found in the timeplus-io proton software, specifically in the inflate() function located in the base/poco/Foundation/src/inflate.c file. This function is a cloned version derived from the madler/zlib library. The vulnerability relates to improper handling of the gzip header extra field within the inflate() function, which can lead to memory corruption by writing outside the intended buffer boundaries.

The issue affects versions of proton before 1.6.16 and was fixed by applying a patch from the upstream madler/zlib repository that addressed the same underlying bug.

Impact Analysis

This vulnerability has a critical impact with a CVSS base score of 10.0, indicating it can be exploited remotely without any privileges or user interaction. The out-of-bounds write can lead to severe consequences such as arbitrary code execution, system crashes, or other unpredictable behavior due to memory corruption.

Because the vulnerability can be triggered remotely and without authentication, attackers could potentially take full control of affected systems running vulnerable versions of proton.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate the CVE-2026-4746 vulnerability, you should update the timeplus-io proton software to version 1.6.16 or later, where the vulnerability has been patched.

The fix involves applying a patch to the vulnerable inflate() function in the base/poco/Foundation/src/inflate.c file, which addresses the bug related to handling the gzip header extra field.

Ensure that your software is using the updated code that includes the upstream fix from the madler/zlib repository, as incorporated in the pull request #943 merged on May 30, 2025.

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