CVE-2026-63430
Severity not reportedammonia is a Rust library for repairing and securing untrusted HTML.
ammonia is a Rust library for repairing and securing untrusted HTML. Prior to 3.3.2, 4.0.2, and 4.1.3, applications that explicitly allow the math tag, annotation-xml, and at least one raw-text HTML element while disallowing the encoding attribute can permit mutation cross-site scripting. ammonia does not correctly implement annotation-xml's encoding-dependent MathML integration-point behavior after attribute filtering removes encoding, so the sanitizer validates a descendant under one namespace interpretation while the browser reparses the output under another. An attacker can use that namespace transition and an allowed raw-text HTML element to execute JavaScript when a user renders the sanitized output. The required tags are not enabled by default, so applications that do not explicitly allow them are not affected. This issue is fixed in versions 3.3.2, 4.0.2, and 4.1.3.
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/rust-ammonia/ammonia/commit/004bf2cee4288f74a6ee619d589e3e90c24c09ca security-advisories@github.com
- https://github.com/rust-ammonia/ammonia/commit/7ac3fd3145236f28857eeecbadb544c8659cba31 security-advisories@github.com
- https://github.com/rust-ammonia/ammonia/commit/b51bf4f9749ed3cd518330105f20a2c39c9ee274 security-advisories@github.com
- https://github.com/rust-ammonia/ammonia/pull/243 security-advisories@github.com
- https://github.com/rust-ammonia/ammonia/pull/244 security-advisories@github.com
- https://github.com/rust-ammonia/ammonia/pull/245 security-advisories@github.com
- https://github.com/rust-ammonia/ammonia/releases/tag/v3.3.2 security-advisories@github.com
- https://github.com/rust-ammonia/ammonia/releases/tag/v4.0.2 security-advisories@github.com
- https://github.com/rust-ammonia/ammonia/releases/tag/v4.1.3 security-advisories@github.com
- https://github.com/rust-ammonia/ammonia/security/advisories/GHSA-9jh8-v38h-cvhr security-advisories@github.com
- https://ivan09999.github.io/ammonia-mxss security-advisories@github.com
- https://rustsec.org/advisories/RUSTSEC-2026-0193.html security-advisories@github.com
- https://github.com/rust-ammonia/ammonia/security/advisories/GHSA-9jh8-v38h-cvhr 134c704f-9b21-4f2e-91b3-4a467353bcc0