---
id: CVE-2026-115897
title: >-
  Serialize JavaScript: Cross-site scripting (XSS) via unescaped </script at the
  end of a serialized function body
summary: >-
  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-in…
severity: low
cvss: 2.1
cvssVector: 'CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N'
cvssSource: cna
cwe:
  - CWE-79
vendor: yahoo
product: serialize-javascript
affected:
  - serialize-javascript < 7.1.3
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-26T15:39:04.934773Z'
published: '2026-10-23'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T17:41:50.594Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115897'
references:
  - url: >-
      https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-m5mm-p8h7-m29v
    label: >-
      https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-m5mm-p8h7-m29v
  - url: 'https://github.com/yahoo/serialize-javascript/pull/235'
    label: 'https://github.com/yahoo/serialize-javascript/pull/235'
  - url: >-
      https://github.com/yahoo/serialize-javascript/commit/2864b3c6260a3bfd52d2db3e70d1a079de108a61
    label: >-
      https://github.com/yahoo/serialize-javascript/commit/2864b3c6260a3bfd52d2db3e70d1a079de108a61
  - url: 'https://github.com/yahoo/serialize-javascript/releases/tag/v7.1.3'
    label: 'https://github.com/yahoo/serialize-javascript/releases/tag/v7.1.3'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115897.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-115897'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2560226'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-115897'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-115897'
  - url: 'https://github.com/advisories/GHSA-m5mm-p8h7-m29v'
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
  - ghsa
  - npm
  - score-dispute
epss: 0.00307
epssPercentile: 0.23318
aliases:
  - GHSA-m5mm-p8h7-m29v
ecosystem: npm
patched:
  - serialize-javascript 7.1.3
scores:
  cna: 2.1
  vendor: 4.4
ingestedAt: '2026-10-24T00:46:53.667Z'
---

## Overview

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.

## Affected

- `serialize-javascript < 7.1.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-115897)

Affected packages:

- `serialize-javascript < 7.1.3`

Patched in:

- `serialize-javascript 7.1.3`

Source: https://github.com/advisories/GHSA-m5mm-p8h7-m29v

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Hardened Images · no fix planned: Red Hat Hardened Images · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115897.json)