ammonia v4.1.2

crates/ammonia/RUSTSEC-0000-0000.md

@@ -0,0 +1,39 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "ammonia"
+date = "2025-09-21"
+categories = ["format-injection"]
+keywords = ["html", "xss"]
+
+[versions]
+patched = [">= 4.1.2", ">= 4.0.1, < 4.1.0", ">= 3.3.1, < 4.0.0"]
+```
+
+# Incorrect handling of embedded SVG and MathML leads to mutation XSS after removal
+
+Affected versions of this crate did not correctly strip namespace-incompatible tags
+in certain situations, causing it to incorrectly account for differences between HTML,
+SVG, and MathML.
+
+This vulnerability only has an effect when the `svg` or `math` tag is allowed,
+because it relies on a tag being parsed as html during the cleaning process, but
+serialized in a way that causes in to be parsed as xml by the browser.
+
+Additionally, the application using this library must allow a tag that is parsed as raw text in HTML.
+These [elements] are:
+
+* title
+* textarea
+* xmp
+* iframe
+* noembed
+* noframes
+* plaintext
+* noscript
+* style
+* script
+
+Applications that do not explicitly allow any of these tags should not be affected, since none are allowed by default.
+
+[elements]: https://github.com/servo/html5ever/blob/57eb334c0ffccc6f88d563419f0fbeef6ff5741c/html5ever/src/tree_builder/rules.rs