What’s Vulnerable › Vulnerabilities

CVE-2026-72925: SWC HTML minifier may allow script element breakout when minifying embedded JSON

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-09-18
• Weakness: CWE-79

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.

Affected products

• @swc html: before 1.15.47-nightly-20260729.1
• swc-project swc: before 1.15.47
• swc-project swc_html_minifier: before 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

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