SWC HTML minifier may allow script element breakout when minifying embedded JSON

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72925
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-11 15:17:38 UTC
Updated2026-08-11 19:18:49 UTC
DescriptionSWC is a TypeScript / JavaScript compiler written in Rust. Prior to @swc/html 1.15.47-nightly-20260729.1 and swc_html_minifier 59.0.0, the minifyJson processing in crates/swc_html_minifier/src/lib.rs parsed and serialized attacker-controlled JSON in application/json and application/ld+json script elements without the escape_json_for_html_script behavior to re-escape less-than signs, allowing a closing script sequence to terminate the element early and execute script in the generated page's origin. This issue is fixed in @swc/html 1.15.47-nightly-20260729.1 and swc_html_minifier 59.0.0.

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.001940000 probability, percentile 0.093220000 (date 2026-08-12)

Problem Types: CWE-79 | CWE-116 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | CWE-116 CWE-116: Improper Encoding or Escaping of Output

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNADECLARED6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Swc-project Swc affected < 1.15.47 Not specified
CNA @swc Html affected < 1.15.47-nightly-20260729.1 Not specified
CNA Swc-project Swc Html Minifier affected < 59.0.0 Not specified

References

ReferenceSourceLinkTags
github.com/swc-project/swc/commit/e1877b44bdac8abc9fd51e984d584f40f6999832 [email protected] github.com
github.com/swc-project/swc/pull/12080 [email protected] github.com
github.com/swc-project/swc/releases/tag/v1.15.47-nightly-20260729.1 [email protected] github.com
github.com/swc-project/swc/security/advisories/GHSA-5qr2-v392-m9g8 [email protected] github.com
github.com/swc-project/swc/releases/tag/v1.15.47 [email protected] github.com
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