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CVE-2026-53752

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

HIGH
7.5
CVSS Score
Published: September 14, 2026 at 05:31 PM UTC
Updated: September 30, 2026 at 05:43 PM UTC
2 products affected across 2 vendorsDOCX4JDOCX4J Core

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Severity
HIGH7.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

DOCX4J Core· Org DOCX4J
60%
v < 11.5.14
Affected range stops below 11.5.14, so it looks safe — our inference, not a vendor statement
DOCX4J· Plutext
60%
v < 11.5.14
Affected range stops below 11.5.14, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

x_refsource_CONFIRM
Source: cverecord
https://github.com/plutext/docx4j/security/advisories/GHSA-gc95-3vw8-vg43
x_refsource_MISC
Source: cverecord
https://github.com/plutext/docx4j/commit/47b528c7dd4c81bcfc8e7fe9df7610c60446f95f
x_refsource_MISC
Source: cverecord
https://github.com/plutext/docx4j/commit/e06cafb334089f0be02e1c63a7c0a602bd44bf06
x_refsource_MISC
Source: cverecord
https://github.com/plutext/docx4j/releases/tag/docx4j-11.5.14

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-674CWE-770

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