CVE-2026-63430Medium· 6.3▾ TwilightPoC availableammonia 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…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 34.7 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
— → 6.3
none → medium
Exploit / PoC code exists
Last analysed / modified upstream
0.6%
0.6% → 0.6%
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
ammonia >= 4.1.0, < 4.1.3Patched in:
ammonia 4.1.3Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-102342Medium· 5.4ammonia is a Rust library for repairing and securing untrusted HTML
RUSTSEC-2026-0373NoneMissing case-insensitive matching for CSS url function
RUSTSEC-2021-0158NoneXSS in ammonia via SVG `animateMotion`, `animateTransform`, and/or `animateColor` tags
RUSTSEC-2021-0157NoneIncorrect escaping for `url("")` functions in CSS style attributes
RUSTSEC-2026-0213NoneXSS in ammonia via SVG `animate` and `set` animation tags
CVE-2021-41182Medium· 6.5jQuery-UI is the official jQuery user interface library