RUSTSEC-2021-0158None▾ SunlitXSS in ammonia via SVG `animateMotion`, `animateTransform`, and/or `animateColor` tags
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
The neutralization that ammonia applied to animate and set was not applied to other forms of SVG animation, which can be used for XSS.
The following SVG will produce a link with a javascript scheme. If the user clicks this link, they will run it.
<svg xmlns="http://www.w3.org/2000/svg">
<a>
<animateMotion attributeName="href" to="javascript:alert('SET_XSS')"></animateMotion>
<text y="30">Click set</text>
</a>
</svg>
Ammonia did not apply attribute filters based on attributeName,
so the contents of the to, from, and values tags were not sanitized as URLs.
Applications that do not explicitly allow any of these tags should not be affected, since none are allowed by default.
This vulnerability was reported by ucsurf.
ammonia >= 4.2.0, < 4.2.3Upgrade to a patched release:
ammonia 4.2.3Connected by shared product, vendor, weakness, or advisory.
RUSTSEC-2021-0157NoneIncorrect escaping for `url("")` functions in CSS style attributes
CVE-2026-102342Medium· 5.4ammonia is a Rust library for repairing and securing untrusted HTML
RUSTSEC-2026-0213NoneXSS in ammonia via SVG `animate` and `set` animation tags
CVE-2026-63430Medium· 6.3ammonia is a Rust library for repairing and securing untrusted HTML