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Ammonia incorrectly handles embedded SVG and MathML leading to mutation XSS after removalGHSA-mm7x-qfjj-5g2c

Fix: rust-ammonia/ammonia@de02971

GHSA-mm7x-qfjj-5g2c is a security vulnerability in ammonia. A fix is available for ammonia — see the affected versions and patch details below.

Also known asRUSTSEC-2025-0071
Published
Updated
Affected
3 pkgs
Patched
3 / 3
Exploits
None indexed
Exploitation data as of Sep 10, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

3 pkgs affected
🦀ammonia🦀ammonia🦀ammonia

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

3 total 3 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.ioammonia≥ 4.1.0&&< 4.1.24.1.2cargo update -p ammonia --precise 4.1.2
🦀crates.ioammonia≥ 4.0.0&&< 4.0.14.0.1cargo update -p ammonia --precise 4.0.1
🦀crates.ioammoniaall versions3.3.1cargo update -p ammonia --precise 3.3.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for ammonia, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update ammonia to 4.1.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-mm7x-qfjj-5g2c is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

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
O3 Security · Impact-Aware SCA

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Ammonia incorrectly handles embedded SVG and…