ExcelJS up to 4.4.0 Image Anchor xl/drawings/drawing1.xml getImages memory allocation

Summaryinfo

A vulnerability described as problematic has been identified in ExcelJS up to 4.4.0. Affected by this vulnerability is the function getImages of the file xl/drawings/drawing1.xml of the component Image Anchor. Executing a manipulation can lead to memory allocation. This vulnerability appears as CVE-2026-128344. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in ExcelJS up to 4.4.0 and classified as problematic. This vulnerability affects the function getImages of the file xl/drawings/drawing1.xml of the component Image Anchor. The manipulation with an unknown input leads to a memory allocation vulnerability. The CWE definition for the vulnerability is CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. As an impact it is known to affect availability. CVE summarizes:

ExcelJS through 4.4.0 contains a memory exhaustion vulnerability that allows attackers to crash applications by supplying a workbook with an unbounded image anchor column in the drawing part. Attackers can set an anchor column such as 300000000 in xl/drawings/drawing1.xml so reading getImages() anchor positions makes Worksheet.getColumn allocate millions of Column objects and abort with a heap out-of-memory error.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-128344 since 11/13/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

By approaching the search of inurl:xl/drawings/drawing1.xml it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

• ExcelJS

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4.0

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