CVE-2026-115897 Serialize JavaScript: Cross-site scripting (XSS) via unescaped </script at the end of a serialized function body

Q: What is CVE-2026-115897?

CVE-2026-115897 is a low-severity vulnerability in yahoo serialize-javascript, published on 23 Oct 2026.

Q: Is CVE-2026-115897 being exploited?

There is no known exploitation of CVE-2026-115897 in the wild and no public exploit code.

Low 2.1 Published 23 Oct 2026 Updated 26 Oct 2026

Exploited in the wild: Not known
Fix: Available

What is CVE-2026-115897?

CVE-2026-115897 is a low-severity vulnerability in yahoo serialize-javascript, published on 23 Oct 2026.

Official description

Serialize JavaScript serializes JavaScript values to a superset of JSON that includes regular expressions and functions. Prior to 7.1.3, the function-source escaping logic does not neutralize a bare closing-script prefix when attacker-influenced function source text ends exactly at that prefix. Because each function body is escaped independently, a delimiter supplied by surrounding serialized output can terminate an HTML script element, and a later serialized value supplies injected markup that becomes a live element in the page. Exploitation requires control of a serialized function's source text, such as through a spoofed toString(). This issue is fixed in version 7.1.3.

Weakness: CWE-79

Which versions are affected by CVE-2026-115897?

How do I fix CVE-2026-115897?

Upgrade to a fixed version.

Is CVE-2026-115897 being exploited?