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CVE-2026-53752

docx4j: Stack Overflow via Cyclic `w:basedOn` Style Chain leads to Denial of Service

CVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-53752

Published

docx4j is an open source Java library for creating, editing, and saving OpenXML packages, including DOCX, PPTX, and XLSX files. Prior to 11.5.14, PropertyResolver and adjacent helpers recursively follow the WordprocessingML w:basedOn style inheritance chain without cycle detection. A well-formed DOCX containing mutually based styles causes unbounded recursion in PropertyResolver.fillPPrStack and related effective-style resolution paths, resulting in StackOverflowError. Server-side conversion and table-of-contents processing of an untrusted document can terminate a worker thread, degrade a thread pool, or deny service, although isolation in disposable workers or safe containment of StackOverflowError can reduce the practical effect. The fix adds cyclic-style tracking and CyclicStylesException handling. This issue is fixed in version 11.5.14.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-53752

Published

docx4j

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "plutext",
                    "product": "docx4j",
                    "versions": [
                        {
                            "version": "< 11.5.14",
                            "status": "affected"
                        }
                    ]
                }

docx4j-core

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "org.docx4j",
                    "product": "docx4j-core",
                    "versions": [
                        {
                            "version": "< 11.5.14",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON