rustsec-2025-0071
Vulnerability from osv_rustsec
Published
2025-09-21 12:00
Modified
2025-10-28 06:02
Summary
Incorrect handling of embedded SVG and MathML leads to mutation XSS after removal
Details

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.

To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "format-injection"
        ],
        "cvss": null,
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "ammonia",
        "purl": "pkg:cargo/ammonia"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.0-0"
            },
            {
              "fixed": "3.3.1"
            },
            {
              "introduced": "4.0.0"
            },
            {
              "fixed": "4.0.1"
            },
            {
              "introduced": "4.1.0"
            },
            {
              "fixed": "4.1.2"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "GHSA-mm7x-qfjj-5g2c"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "Affected versions of this crate did not correctly strip namespace-incompatible tags\nin certain situations, causing it to incorrectly account for differences between HTML,\nSVG, and MathML.\n\nThis vulnerability only has an effect when the `svg` or `math` tag is allowed,\nbecause it relies on a tag being parsed as html during the cleaning process, but\nserialized in a way that causes in to be parsed as xml by the browser.\n\nAdditionally, the application using this library must allow a tag that is parsed as raw text in HTML.\nThese [elements] are:\n\n* title\n* textarea\n* xmp\n* iframe\n* noembed\n* noframes\n* plaintext\n* noscript\n* style\n* script\n\nApplications that do not explicitly allow any of these tags should not be affected, since none are allowed by default.\n\n[elements]: https://github.com/servo/html5ever/blob/57eb334c0ffccc6f88d563419f0fbeef6ff5741c/html5ever/src/tree_builder/rules.rs",
  "id": "RUSTSEC-2025-0071",
  "modified": "2025-10-28T06:02:18Z",
  "published": "2025-09-21T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/ammonia"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2025-0071.html"
    }
  ],
  "related": [],
  "severity": [],
  "summary": "Incorrect handling of embedded SVG and MathML leads to mutation XSS after removal"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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