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

Low · CVSS 2.3CVE-2026-97711

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

Answer in brief

CVE-2026-97711 records a Low severity (CVSS 2.3) vulnerability in Serialize JavaScript: Cross-site scripting (XSS) via unescaped </script> in serialized function bodies. The current sources do not mark it as known exploited. The current feed maps yahoo/serialize-javascript (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Sep 29, 2026Updated Sep 29, 2026Source checked Sep 29, 2026First seen by HOL Sep 29, 2026Material review Sep 29, 2026

Upstream Advisory

Key facts

Risk: Low · CVSS 2.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 2.3. 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). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
yahoo/serialize-javascriptgeneric	>=7.1.1 <7.1.2	7.1.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for yahoo/serialize-javascript.
Review the reported fix. Update yahoo/serialize-javascript to 7.1.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 29, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.