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CVE-2026-71497: jsoup: Cleaner may expose markup with custom raw-text elements

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-06 · updated 2026-10-24
• Weakness: CWE-79

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.

Affected products

• jhy jsoup: from 1.14.3, < 1.23.1

References

• https://github.com/jhy/jsoup/commit/92f1aca552548b484bc7d4b94c51e48b8e6eca70
• https://github.com/jhy/jsoup/issues/2538
• https://github.com/jhy/jsoup/releases/tag/jsoup-1.23.1
• https://github.com/jhy/jsoup/security/advisories/GHSA-pmhh-3w7g-xqp8

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