What’s Vulnerable › Vulnerabilities

CVE-2026-97711: Serialize JavaScript: Cross-site scripting (XSS) via unescaped </script> in serialized function bodies

• Severity: low (CVSS 2.3 v4.0)
• 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: 2026-09-29 · updated 2026-09-30
• Weakness: CWE-79

Description

Serialize JavaScript serializes JavaScript values to a superset of JSON that includes regular expressions and functions. From 7.1.1 until 7.1.2, function values serialized by serialize-javascript are not fully protected against script-closing tags in attacker-influenced function source because SCRIPT_CLOSE_REGEXP can consume a second closing tag inside one match. When the serialized function is embedded in a script element, the surviving closing tag terminates the element early and causes the remaining output to be parsed as HTML, enabling cross-site scripting in the page origin. Only function values are affected; ordinary data values and options.isJSON output are unaffected. This issue is fixed in version 7.1.2.

Affected products

• yahoo serialize-javascript: from 7.1.1, < 7.1.2

References

• https://github.com/yahoo/serialize-javascript/commit/2bdbaaff9cb8a4639135eb24cfcd383d3fefb534
• https://github.com/yahoo/serialize-javascript/releases/tag/v7.1.2
• https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-gfhx-hw2g-v5hg

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