medium6.1
CVE-2026-72925
SWC HTML minifier may allow script element breakout when minifying embedded JSON
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @swc/html | < 1.15.47-nightly-20260729.1 | 1.15.47-nightly-20260729.1 |
| rust | swc_html_minifier | < 59.0.0 | 59.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-5qr2-v392-m9g8
- https://github.com/swc-project/swc/security/advisories/GHSA-5qr2-v392-m9g8
- https://nvd.nist.gov/vuln/detail/CVE-2026-72925
- 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