XSS in @Swc HTML
CVE-2026-72925
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (24.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 24.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- @Swc HTML — versions < 1.15.47-nightly-20260729.1
- Swc-Project Swc — versions < 1.15.47
- Swc-Project Swc HTML Minifier — versions < 59.0.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-72925?
- CVE-2026-72925 is a medium-severity vulnerability in @Swc HTML, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-08-11.
- How severe is CVE-2026-72925?
- Medium severity. CVSS v3 base score is 6.1 out of 10.