Vulnerability MediumRUSTSEC-2026-0213 · ammonia
RUSTSEC-2026-0213: XSS in ammonia via SVG `animate` and `set` animation tags
Short answerA security vulnerability in the ammonia crate: XSS in ammonia via SVG `animate` and `set` animation tags. GitHub rates it Medium. Fixed in 3.3.3, 4.0.3, 4.1.4: update to a fixed version.
| Crate | ammonia |
|---|---|
| Type | Vulnerability (format-injection) |
| Affected versions | Before 3.3.3; from 4.0.0 before 4.0.3; from 4.1.0 before 4.1.4. |
| Fixed in | 3.3.3, 4.0.3, 4.1.4 |
| Severity | Medium (GitHub rating) |
| Published | 2026-07-21 |
| Last changed | 2026-09-30 |
| Also known as | CVE-2026-102342, GHSA-m6mh-2hw2-555x |
What to do
- See which version you have:
cargo tree -i ammonia(it also shows which of your dependencies pulls it in). - Update within your version requirement:
cargo update -p ammonia. If the fix is a newer major or minor than your requirement allows, raise it in Cargo.toml (for exampleammonia = "4.1.4") or update the dependency that pulls it in. - Check again with
cargo audit, or paste your Cargo.lock into our Cargo.toml checker.
Details from the advisory
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>
<set attributeName="href" to="javascript:alert('SET_XSS')"></set>
<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 either of these tags should not be affected, since neither are allowed by default.
---
**Discovered by:** Younghun Ko (@koyokr)
References
- Package: crates.io/crates/ammonia
- Advisory: rustsec.org/advisories/RUSTSEC-2026-0213.html
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
Other advisories for ammonia
- Vulnerability HighRUSTSEC-2019-0001 · 2019-04-27Uncontrolled recursion leads to abort in HTML serialization
- VulnerabilityRUSTSEC-2021-0074 · 2021-07-08Incorrect handling of embedded SVG and MathML leads to mutation XSS
- VulnerabilityRUSTSEC-2021-0157 · 2021-10-10Incorrect escaping for `url("")` functions in CSS style attributes
- VulnerabilityRUSTSEC-2021-0158 · 2021-10-10XSS in ammonia via SVG `animateMotion`, `animateTransform`, and/or `animateColor` tags
- VulnerabilityRUSTSEC-2022-0003 · 2022-01-19Space bug in `clean_text`
- VulnerabilityRUSTSEC-2025-0071 · 2025-09-21Incorrect handling of embedded SVG and MathML leads to mutation XSS after removal
- VulnerabilityRUSTSEC-2026-0193 · 2026-06-30mXSS in ammonia via MathML `annotation-xml` encoding strip
- VulnerabilityRUSTSEC-2026-0373 · 2026-10-16Missing case-insensitive matching for CSS url function
Up next
Same crateammonia: security historyEvery advisory for this crate, and whether it is safe to use today.Read it next →Did this answer your question?