CVE-2026-71497
Description
A flaw was found in jsoup, a Java library for working with HTML. The HTML parser incorrectly handles malformed tag names ending in a control character. When a custom Safelist allows certain raw-text elements, this misparsing can cause content that should be inert to be processed as active markup after serialization. This could allow a remote attacker to achieve cross-site scripting (XSS).
Statement
This cross-site scripting flaw in jsoup requires a custom Safelist that explicitly allows raw-text elements, which is not a default configuration. Exploitation is limited to applications processing untrusted HTML with such a permissive custom Safelist, reducing the overall risk.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.7 | N/A | 4.7 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | None | N/A | None |
| User Interaction | Required | N/A | Required |
| Scope | Changed | N/A | Changed |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Understanding the Weakness (CWE)
Other
Technical Impact: Varies by Context
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