Description
SWC 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.
Metrics
CVSS 3.1 6.1/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NWeakness enumeration
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| swc-project | swc | < 1.15.47 |
| @swc | html | < 1.15.47-nightly-20260729.1 |
| swc-project | swc_html_minifier | < 59.0.0 |
References
- https://github.com/swc-project/swc/commit/e1877b44bdac8abc9fd51e984d584f40f6999832
- https://github.com/swc-project/swc/pull/12080
- https://github.com/swc-project/swc/releases/tag/v1.15.47
- https://github.com/swc-project/swc/releases/tag/v1.15.47-nightly-20260729.1
- https://github.com/swc-project/swc/security/advisories/GHSA-5qr2-v392-m9g8
Timeline
- Published
- Aug 11, 2026
- Last modified
- Sep 18, 2026
- NVD status
- Awaiting Analysis