CVE-2026-4738
Received Received - Intake

Buffer Overflow in OSGeo GDAL infback9 Module Allows Memory Corruption

Publication date: 2026-03-24

Last updated on: 2026-03-24

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

Description
Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in OSGeo gdal (frmts/zlib/contrib/infback9 modules). This vulnerability is associated with program files inftree9.C‎. This issue affects gdal: before 3.11.0.

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Meta Information

Published
2026-03-24
Last Modified
2026-03-24
Generated
2026-07-06
AI Q&A
2026-03-24
EPSS Evaluated
2026-07-04
NVD
CVE-2026-4738
EUVD
EUVD-2026-14706

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
osgeo gdal to 3.11.0 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

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Detection Guidance

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Mitigation Strategies

To mitigate this vulnerability, you should upgrade the OSGeo GDAL software to version 3.11.0 or later, where the security fix has been applied.

The fix involves backporting a patch from the official zlib repository that removes an offset pointer optimization in the vulnerable inftree9.c file, eliminating the improper memory buffer operation.

Ensure that your GDAL installation is updated to include this patch, which was merged into the master branch on May 1, 2025, and targeted for the 3.11.0 release.

Executive Summary

This vulnerability is an improper restriction of operations within the bounds of a memory buffer in the OSGeo GDAL project, specifically in the frmts/zlib/contrib/infback9 modules and the file inftree9.c. It relates to cloned functions originally from the madler/zlib library that had similar vulnerabilities. The issue could allow operations that exceed the intended memory buffer limits, potentially leading to security risks.

Impact Analysis

Exploitation of this vulnerability could lead to serious security impacts due to improper memory operations. Given the high CVSS score of 9.4, it indicates a critical severity with network attack vector and low complexity. Potential impacts include unauthorized code execution, data corruption, or denial of service, as the vulnerability involves operations outside the intended memory buffer boundaries.

Compliance Impact

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