jsoup XmlTreeBuilder vulnerable to memory exhaustion through deeply nested namespace declarations
jsoup through 1.23.2, fixed in commit 862ba2f, contains an uncontrolled resource consumption vulnerability in XmlTreeBuilder that allows remote attackers to exhaust JVM heap memory by supplying a deeply nested XML document with uniquely-namespaced elements. The builder copies the entire inherited namespace map on every start element, causing quadratic time and memory complexity, which attackers can exploit to trigger an OutOfMemoryError and terminate the application.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Java / Kotlin (Maven) | org.jsoup:jsoup | < 1.23.2 | 1.23.2 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-75140
- https://github.com/jhy/jsoup/pull/2556
- https://github.com/jhy/jsoup/commit/862ba2f1d48ee95609183dbcfc848c9fd7afc76a
- https://github.com/jhy/jsoup
- https://github.com/jhy/jsoup/releases/tag/jsoup-1.23.2
- https://www.vulncheck.com/advisories/jsoup-uncontrolled-resource-consumption-in-xmltreebuilder
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-770- Platform
- Java / Kotlin (Maven)
- Package
org.jsoup:jsoup- Disclosed
- 20.08.2026
- Updated
- 11.10.2026 13:20
Sources and licenses
OSV / GitHub Advisory Database - GHSA-65r4-943x-97jj - CC BY 4.0
Vulnerability history: org.jsoup:jsoup
All published vulnerabilities of this package (Java / Kotlin (Maven)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 5
- First → latest
- 08.2021 08.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 2
- Medium 3
Disclosures per year
- 2021: 1
- 2022: 2
- 2023: 0
- 2024: 0
- 2025: 0
- 2026: 2
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jsoup XmlTreeBuilder vulnerable to memory exhaustion through deeply nested namespace declarations this entry
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