CVE-2026-41240

@@ -602,7 +602,7 @@ function createDOMPurify() {
     /* Parse profile info */
     if (USE_PROFILES) {
       ALLOWED_TAGS = addToSet({}, text);
-      ALLOWED_ATTR = [];
+      ALLOWED_ATTR = create(null);
       if (USE_PROFILES.html === true) {
         addToSet(ALLOWED_TAGS, html$1);
         addToSet(ALLOWED_ATTR, html);
@@ -623,6 +623,13 @@ function createDOMPurify() {
         addToSet(ALLOWED_ATTR, xml);
       }
     }
+    /* Prevent function-based ADD_ATTR / ADD_TAGS from leaking across calls */
+    if (!objectHasOwnProperty(cfg, 'ADD_TAGS')) {
+      EXTRA_ELEMENT_HANDLING.tagCheck = null;
+    }
+    if (!objectHasOwnProperty(cfg, 'ADD_ATTR')) {
+      EXTRA_ELEMENT_HANDLING.attributeCheck = null;
+    }
     /* Merge configuration parameters */
     if (cfg.ADD_TAGS) {
       if (typeof cfg.ADD_TAGS === 'function') {
@@ -1020,6 +1027,10 @@ function createDOMPurify() {
    */
   // eslint-disable-next-line complexity
   const _isValidAttribute = function _isValidAttribute(lcTag, lcName, value) {
+    /* FORBID_ATTR must always win, even if ADD_ATTR predicate would allow it */
+    if (FORBID_ATTR[lcName]) {
+      return false;
+    }
     /* Make sure attribute cannot clobber */
     if (SANITIZE_DOM && (lcName === 'id' || lcName === 'name') && (value in document || value in formElement)) {
       return false;

@@ -600,7 +600,7 @@ function createDOMPurify() {
     /* Parse profile info */
     if (USE_PROFILES) {
       ALLOWED_TAGS = addToSet({}, text);
-      ALLOWED_ATTR = [];
+      ALLOWED_ATTR = create(null);
       if (USE_PROFILES.html === true) {
         addToSet(ALLOWED_TAGS, html$1);
         addToSet(ALLOWED_ATTR, html);
@@ -621,6 +621,13 @@ function createDOMPurify() {
         addToSet(ALLOWED_ATTR, xml);
       }
     }
+    /* Prevent function-based ADD_ATTR / ADD_TAGS from leaking across calls */
+    if (!objectHasOwnProperty(cfg, 'ADD_TAGS')) {
+      EXTRA_ELEMENT_HANDLING.tagCheck = null;
+    }
+    if (!objectHasOwnProperty(cfg, 'ADD_ATTR')) {
+      EXTRA_ELEMENT_HANDLING.attributeCheck = null;
+    }
     /* Merge configuration parameters */
     if (cfg.ADD_TAGS) {
       if (typeof cfg.ADD_TAGS === 'function') {
@@ -1018,6 +1025,10 @@ function createDOMPurify() {
    */
   // eslint-disable-next-line complexity
   const _isValidAttribute = function _isValidAttribute(lcTag, lcName, value) {
+    /* FORBID_ATTR must always win, even if ADD_ATTR predicate would allow it */
+    if (FORBID_ATTR[lcName]) {
+      return false;
+    }
     /* Make sure attribute cannot clobber */
     if (SANITIZE_DOM && (lcName === 'id' || lcName === 'name') && (value in document || value in formElement)) {
       return false;

@@ -606,7 +606,7 @@
       /* Parse profile info */
       if (USE_PROFILES) {
         ALLOWED_TAGS = addToSet({}, text);
-        ALLOWED_ATTR = [];
+        ALLOWED_ATTR = create(null);
         if (USE_PROFILES.html === true) {
           addToSet(ALLOWED_TAGS, html$1);
           addToSet(ALLOWED_ATTR, html);
@@ -627,6 +627,13 @@
           addToSet(ALLOWED_ATTR, xml);
         }
       }
+      /* Prevent function-based ADD_ATTR / ADD_TAGS from leaking across calls */
+      if (!objectHasOwnProperty(cfg, 'ADD_TAGS')) {
+        EXTRA_ELEMENT_HANDLING.tagCheck = null;
+      }
+      if (!objectHasOwnProperty(cfg, 'ADD_ATTR')) {
+        EXTRA_ELEMENT_HANDLING.attributeCheck = null;
+      }
       /* Merge configuration parameters */
       if (cfg.ADD_TAGS) {
         if (typeof cfg.ADD_TAGS === 'function') {
@@ -1024,6 +1031,10 @@
      */
     // eslint-disable-next-line complexity
     const _isValidAttribute = function _isValidAttribute(lcTag, lcName, value) {
+      /* FORBID_ATTR must always win, even if ADD_ATTR predicate would allow it */
+      if (FORBID_ATTR[lcName]) {
+        return false;
+      }
       /* Make sure attribute cannot clobber */
       if (SANITIZE_DOM && (lcName === 'id' || lcName === 'name') && (value in document || value in formElement)) {
         return false;

@@ -1,3 +1,3 @@
 /*! @license DOMPurify 3.3.1 | (c) Cure53 and other contributors | Released under the Apache license 2.0 and Mozilla Public License 2.0 | github.com/cure53/DOMPurify/blob/3.3.1/LICENSE */
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 //# sourceMappingURL=purify.min.js.map

@@ -610,7 +610,7 @@ function createDOMPurify(window: WindowLike = getGlobal()): DOMPurify {
     /* Parse profile info */
     if (USE_PROFILES) {
       ALLOWED_TAGS = addToSet({}, TAGS.text);
-      ALLOWED_ATTR = [];
+      ALLOWED_ATTR = create(null);
       if (USE_PROFILES.html === true) {
         addToSet(ALLOWED_TAGS, TAGS.html);
         addToSet(ALLOWED_ATTR, ATTRS.html);
@@ -635,6 +635,15 @@ function createDOMPurify(window: WindowLike = getGlobal()): DOMPurify {
       }
     }
 
+    /* Prevent function-based ADD_ATTR / ADD_TAGS from leaking across calls */
+    if (!objectHasOwnProperty(cfg, 'ADD_TAGS')) {
+      EXTRA_ELEMENT_HANDLING.tagCheck = null;
+    }
+
+    if (!objectHasOwnProperty(cfg, 'ADD_ATTR')) {
+      EXTRA_ELEMENT_HANDLING.attributeCheck = null;
+    }
+
     /* Merge configuration parameters */
     if (cfg.ADD_TAGS) {
       if (typeof cfg.ADD_TAGS === 'function') {
@@ -1202,6 +1211,11 @@ function createDOMPurify(window: WindowLike = getGlobal()): DOMPurify {
     lcName: string,
     value: string
   ): boolean {
+    /* FORBID_ATTR must always win, even if ADD_ATTR predicate would allow it */
+    if (FORBID_ATTR[lcName]) {
+      return false;
+    }
+
     /* Make sure attribute cannot clobber */
     if (
       SANITIZE_DOM &&