CVE-2026-63430

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2026-63430
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63430.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-63430
Aliases
Downstream
Published
2026-10-15T18:10:35Z
Modified
2026-10-16T10:30:39Z
Severity
  • 6.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N CVSS Calculator
Summary
ammonia: mXSS in ammonia via MathML `annotation-xml` encoding strip
Details

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.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-79"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63430.json"
}
References

Affected packages

Git / github.com/rust-ammonia/ammonia

Affected ranges

Type
GIT
Repo
https://github.com/rust-ammonia/ammonia
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
676076ec601ac1226867a8593672f048b8f0af9b
Introduced
6a1f85654cd90c2d131baf83267c5846ec8a7625
Fixed
8d95e4932acbfd1cc74ed55a16474b4577a1b9d5
Introduced
96b30961998868972af2eb73dd343bc09ff68277
Fixed
2c56268b885dbb390f3dafed939d31f8eb369b07
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "3.3.2"
        },
        {
            "introduced":  "4.0.0"
        },
        {
            "fixed":  "4.0.2"
        },
        {
            "introduced":  "4.1.0"
        },
        {
            "fixed":  "4.1.3"
        }
    ],
    "source":  "AFFECTED_FIELD"
}

Affected versions

v0.*
v0.2.0
v0.4.0
v0.5.0
v0.6.0
v0.7.0
v1.*
v1.0.0
v1.0.0-rc1
v1.0.0-rc2
v1.0.0-rc3
v1.0.1
v1.1.0
v1.2.0
v2.*
v2.0.0
v2.1.0
v2.1.1
v2.1.2
v2.1.3
v3.*
v3.0.0
v3.1.0
v3.1.1
v3.1.2
v3.1.3
v3.1.4
v3.2.0
v3.2.1
v3.3.0
v3.3.1
v4.*
v4.0.0
v4.0.1
v4.1.0
v4.1.1

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63430.json"