diff --git a/lib/rules/template-no-block-params-for-html-elements.js b/lib/rules/template-no-block-params-for-html-elements.js
index 37b96bad53..5912ee77a0 100644
--- a/lib/rules/template-no-block-params-for-html-elements.js
+++ b/lib/rules/template-no-block-params-for-html-elements.js
@@ -1,6 +1,10 @@
-/** @type {import('eslint').Rule.RuleModule} */
 const htmlTags = require('html-tags');
+const svgTags = require('svg-tags');
+const { mathmlTagNames } = require('mathml-tag-names');
+
+const ELEMENT_TAGS = new Set([...htmlTags, ...svgTags, ...mathmlTagNames]);
 
+/** @type {import('eslint').Rule.RuleModule} */
 module.exports = {
   meta: {
     type: 'problem',
@@ -20,23 +24,21 @@ module.exports = {
 
   create(context) {
     const sourceCode = context.sourceCode;
-    const HTML_ELEMENTS = new Set(htmlTags);
 
     return {
       GlimmerElementNode(node) {
-        // Check if this is an HTML element (lowercase)
-        if (!HTML_ELEMENTS.has(node.tag)) {
+        if (!ELEMENT_TAGS.has(node.tag)) {
           return;
         }
 
-        // If the tag name is a variable in scope, it's being used as a component, not an HTML element
+        // A known HTML/SVG tag can still be a component if it's bound in scope
+        // (block param, import, local).
         const scope = sourceCode.getScope(node.parent);
         const isVariable = scope.references.some((ref) => ref.identifier === node.parts[0]);
         if (isVariable) {
           return;
         }
 
-        // Check for block params
         if (node.blockParams && node.blockParams.length > 0) {
           context.report({
             node,
diff --git a/package.json b/package.json
index de20f9800e..c2af296d2f 100644
--- a/package.json
+++ b/package.json
@@ -66,15 +66,17 @@
     "aria-query": "^5.3.2",
     "css-tree": "^3.0.1",
     "editorconfig": "^3.0.2",
-    "ember-eslint-parser": "^0.9.0",
+    "ember-eslint-parser": "^0.10.0",
     "ember-rfc176-data": "^0.3.18",
     "eslint-utils": "^3.0.0",
     "estraverse": "^5.3.0",
     "html-tags": "^3.3.1",
     "lodash.camelcase": "^4.3.0",
     "lodash.kebabcase": "^4.1.1",
+    "mathml-tag-names": "^4.0.0",
     "requireindex": "^1.2.0",
-    "snake-case": "^3.0.3"
+    "snake-case": "^3.0.3",
+    "svg-tags": "^1.0.0"
   },
   "devDependencies": {
     "@babel/core": "^7.25.9",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index ea58f19332..083c39a462 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -21,8 +21,8 @@ importers:
         specifier: ^3.0.2
         version: 3.0.2
       ember-eslint-parser:
-        specifier: ^0.9.0
-        version: 0.9.0(@typescript-eslint/parser@8.58.1(eslint@8.57.1)(typescript@5.9.3))(typescript@5.9.3)
+        specifier: ^0.10.0
+        version: 0.10.0(@typescript-eslint/parser@8.58.1(eslint@8.57.1)(typescript@5.9.3))(typescript@5.9.3)
       ember-rfc176-data:
         specifier: ^0.3.18
         version: 0.3.18
@@ -41,12 +41,18 @@ importers:
       lodash.kebabcase:
         specifier: ^4.1.1
         version: 4.1.1
+      mathml-tag-names:
+        specifier: ^4.0.0
+        version: 4.0.0
       requireindex:
         specifier: ^1.2.0
         version: 1.2.0
       snake-case:
         specifier: ^3.0.3
         version: 3.0.4
+      svg-tags:
+        specifier: ^1.0.0
+        version: 1.0.0
     devDependencies:
       '@babel/core':
         specifier: ^7.25.9
@@ -1775,8 +1781,8 @@ packages:
   electron-to-chromium@1.5.335:
     resolution: {integrity: sha512-q9n5T4BR4Xwa2cwbrwcsDJtHD/enpQ5S1xF1IAtdqf5AAgqDFmR/aakqH3ChFdqd/QXJhS3rnnXFtexU7rax6Q==}
 
-  ember-eslint-parser@0.9.0:
-    resolution: {integrity: sha512-/Z/eoBmkeVdS+UjrocxKuLP4HG9K7XxZgpVvFjDBZ+o3gXYpbnvWkL+wYjaxzySXm3cuuCvnGW5NppIh9Vl/ig==}
+  ember-eslint-parser@0.10.0:
+    resolution: {integrity: sha512-oq37TDYDBqR4fTGhJy/Yecw5VHlPJrSCd26KkwCKlhzAHMCzac+/HSln99COihKei2mMaaob17IrV3I9XL83YQ==}
     engines: {node: '>=16.0.0'}
     peerDependencies:
       '@typescript-eslint/parser': '*'
@@ -5642,7 +5648,7 @@ snapshots:
 
   electron-to-chromium@1.5.335: {}
 
-  ember-eslint-parser@0.9.0(@typescript-eslint/parser@8.58.1(eslint@8.57.1)(typescript@5.9.3))(typescript@5.9.3):
+  ember-eslint-parser@0.10.0(@typescript-eslint/parser@8.58.1(eslint@8.57.1)(typescript@5.9.3))(typescript@5.9.3):
     dependencies:
       '@glimmer/syntax': 0.95.0
       '@typescript-eslint/tsconfig-utils': 8.58.1(typescript@5.9.3)
diff --git a/tests/lib/rules/template-no-block-params-for-html-elements.js b/tests/lib/rules/template-no-block-params-for-html-elements.js
index c7a50ad9dc..62bbc97155 100644
--- a/tests/lib/rules/template-no-block-params-for-html-elements.js
+++ b/tests/lib/rules/template-no-block-params-for-html-elements.js
@@ -17,6 +17,11 @@ ruleTester.run('template-no-block-params-for-html-elements', rule, {
     '<template><MyComponent as |item|>{{item.name}}</MyComponent></template>',
     '<template>{{#each this.items as |item|}}<li>{{item}}</li>{{/each}}</template>',
     '<template><button>Click</button></template>',
+    // Custom elements aren't in the html-tags/svg-tags allowlists, so they're
+    // not flagged. Accepted false negative — web component namespace is open.
+    '<template><my-element as |x|>{{x}}</my-element></template>',
+    // Namespaced/path component invocations aren't in the allowlists either.
+    '<template><NS.Foo as |x|>{{x}}</NS.Foo></template>',
   ],
 
   invalid: [
@@ -50,5 +55,27 @@ ruleTester.run('template-no-block-params-for-html-elements', rule, {
         },
       ],
     },
+    {
+      // SVG element — in svg-tags allowlist.
+      code: '<template><circle as |r|>{{r}}</circle></template>',
+      output: null,
+      errors: [
+        {
+          message: 'Block params can only be used with components, not HTML elements.',
+          type: 'GlimmerElementNode',
+        },
+      ],
+    },
+    {
+      // MathML element — in mathml-tag-names allowlist.
+      code: '<template><mfrac as |num|>{{num}}</mfrac></template>',
+      output: null,
+      errors: [
+        {
+          message: 'Block params can only be used with components, not HTML elements.',
+          type: 'GlimmerElementNode',
+        },
+      ],
+    },
   ],
 });