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GHSA-5qr2-v392-m9g8
swc_html_minifier
@swc/htmlImpact
@swc/html minifies JSON contained in script elements such as
application/json and application/ld+json by parsing and serializing the
JSON value.
Before the patched versions, JSON serialization could convert escaped
less-than signs such as \u003C into literal < characters. If the JSON
contained an escaped </script> sequence, the generated HTML could terminate
the containing script element early because HTML tokenization occurs before
the JSON is consumed.
Applications that minify HTML containing attacker-controlled JSON data could therefore transform inert data into active markup. A crafted payload could execute script in the origin of the generated page.
Patches
The issue is fixed in:
@swc/html1.15.47swc_html_minifier59.0.0
The minifier now re-escapes less-than signs after JSON serialization, preserving the script element boundary.
Workarounds
Users who cannot upgrade can disable JSON minification with:
await minify(html, {
minifyJson: false,
});
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The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The vulnerability can affect other systems as well, not just the initial system. There is a low impact on the confidentiality of the information. There is a low impact on the integrity of the data.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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