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Back to active CVEs
Low · CVSS 2.1CVE-2026-115897GHSA-M5MM-P8H7-M29V

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

Answer in brief

CVE-2026-115897 records a Low severity (CVSS 2.1) vulnerability in Serialize JavaScript: Cross-site scripting (XSS) via unescaped </script at the end of a serialized function body. The current sources do not mark it as known exploited. The current feed maps yahoo/serialize-javascript (generic), serialize-javascript (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 23, 2026Updated Oct 23, 2026Source checked Oct 23, 2026First seen by HOL Oct 23, 2026Material review Oct 23, 2026
Upstream Advisory

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Oct 23, 2026
References
5 linked sources
Open source record

Key facts

Risk
Low · CVSS 2.1
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 2.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps yahoo/serialize-javascript (generic), serialize-javascript (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
yahoo/serialize-javascriptgeneric<7.1.37.1.3
serialize-javascriptnpm<7.1.37.1.3

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for yahoo/serialize-javascript, serialize-javascript.
  2. 2Review the reported fix. Update yahoo/serialize-javascript to 7.1.3; serialize-javascript to 7.1.3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 23, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 23, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

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