CVE-2026-72925
SWC HTML minifier may allow script element breakout when minifying embedded JSON
- State
- Published
- Severity
- 6.1 Medium
- Published
- Aug 11, 2026
- Updated
- Aug 11, 2026
- Reserved
- Aug 10, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.1 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | GitHub_M |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
swcswc-project |
|
html@swc |
|
swc_html_minifierswc-project |
|
References
- https://github.com/swc-project/swc/security/advisories/GHSA-5qr2-v392-m9g8
- https://github.com/swc-project/swc/pull/12080
- https://github.com/swc-project/swc/commit/e1877b44bdac8abc9fd51e984d584f40f6999832
- 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
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