CVE Catalog

CVE-2026-39823

MediumCVSS 6.1
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.31%

24th percentile - higher than 24% of all known CVEs

Summary

The vulnerability fixed in CVE-2026-27142 involved incorrect escaping of URLs inside a <meta> tag's <content> attribute. If the URL content inserted ASCII whitespaces around the '=' rune, the escaper would fail to escape it, leading to XSS.

Risk Assessment

An attacker could exploit this to inject JavaScript and perform an XSS attack in the user's browser.

Recommendation

Ensure the fix from CVE-2026-27142 or a newer version of the library that correctly escapes whitespace in the content attribute is applied.

Related vulnerabilities

Original NVD description (English source)

CVE-2026-27142 fixed a vulnerability in which URLs were not correctly escaped inside of a <meta> tag's <content> attribute. If the URL content were to insert ASCII whitespaces around the '=' rune inside of the <content> attribute, the escaper would fail to similarly escape it, leading to XSS.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS