---
id: CVE-2026-115754
title: >-
  serialize-javascript: serialize-javascript: Cross-site scripting via unescaped
  function serialization (CVE-2026-115754)
summary: >-
  A flaw was found in serialize-javascript. This vulnerability allows an
  attacker to conduct cross-site scripting (XSS) attacks by supplying crafted
  function source text containing unescaped script closing tags. When serialized
  into a web pa…
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N'
cvssSource: vendor
cwe: CWE-79
vendor: Red Hat
product: Red Hat Hardened Images
affected:
  - hardened_images
published: '2026-10-23'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T20:10:01+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115754.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-115754.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-115754'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2559880'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-115754'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-115754'
  - url: >-
      https://github.com/yahoo/serialize-javascript/commit/2864b3c6260a3bfd52d2db3e70d1a079de108a61
  - url: 'https://github.com/yahoo/serialize-javascript/pull/235'
  - url: 'https://github.com/yahoo/serialize-javascript/releases/tag/v7.1.3'
  - url: >-
      https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-m5mm-p8h7-m29v
  - url: >-
      https://www.vulncheck.com/advisories/serialize-javascript-7.0.1-before-7.1.3-xss-via-unescaped-script-in-function-body
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-23T14:48:53.139109Z'
ingestedAt: '2026-10-23T14:28:08.714Z'
epss: 0.00231
epssPercentile: 0.13906
---

## Overview

A flaw was found in serialize-javascript. This vulnerability allows an attacker to conduct cross-site scripting (XSS) attacks by supplying crafted function source text containing unescaped script closing tags. When serialized into a web page, the malicious payload can prematurely close the enclosing script element and execute arbitrary code in the context of the victim's browser session.

## 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-2026-115754.json)

**serialize-javascript: serialize-javascript: Cross-site scripting via unescaped function serialization** — rated Moderate by Red Hat. Released 2026-10-23.

Affected:

- Red Hat Hardened Images

No fix planned:

- Red Hat Hardened Images

Not affected:

- Red Hat Hardened Images

## Remediation

Affected