CVE-2026-71497 Details
Description
jsoup is a Java library for working with real-world HTML. From 1.14.3 until 1.23.1, jsoup's HTML parser could incorrectly handle a malformed tag name ending in a control character, causing the tag to acquire the parsing behavior of a different element. When a custom Safelist permits certain raw-text elements, this misparsing can cause content that should remain inert text to be emitted as active markup after serialization, potentially resulting in cross-site scripting. jsoup's built-in Safelists are not affected. This issue is fixed in version 1.23.1.
A vulnerability in jsoup's HTML parser, present in versions 1.14.3 prior to 1.23.1, allows for incorrect handling of malformed tag names that end in control characters. This mismanagement can cause the tags to be parsed as different elements. When a custom Safelist permits certain raw-text elements, this can lead to the unintended serialization of inert text as active markup, potentially causing cross-site scripting (XSS) issues. It's important to note that jsoup's built-in Safelists do not have this vulnerability.
Users should upgrade to jsoup version 1.23.1, which addresses this vulnerability by properly preserving control characters in tag names during parsing. Instructions for downloading the latest version can be found on the jsoup GitHub releases page.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Aug 7, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
No affected product data is available for this CVE.
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 7, 2026 | CVE Modified | CISA-ADP |
| Aug 6, 2026 | New CVE Received | [email protected] |