{"id":"CVE-2026-41238","aliases":["CLSA-2026-1774743817","CLSA-2026-1774743830","CLSA-2026-1778546719","CLSA-2026-1778805976","CLSA-2026-1780274966","CLSA-2026-1786731948","CLSA-2026-1787602198","CLSA-2026-1792155851","CLSA-2026-1792156267","CLSA-2026-1792156282","CLSA-2026-1792156382","CLSA-2026-1792156694","CLSA-2026-1792157013","CLSA-2026-1792157113","CLSA-2026-1792369452","CLSA-2026-1792424561","CLSA-2026-1792424669","CLSA-2026-1792453557","CLSA-2026-1792479087","CLSA-2026-1792486117","CLSA-2026-1792496766","CLSA-2026-1792594075","DEBIAN-CVE-2026-41238","EUVD-2026-25236","GHSA-2cf5-4w76-r9qv","GHSA-39q2-94rc-95cp","GHSA-55q2-fjhq-7xh7","GHSA-c2j3-45gr-mqc4","GHSA-cj63-jhhr-wcxv","GHSA-cjmm-f4jc-qw8r","GHSA-g9r4-xpmj-mj65","GHSA-h8r8-wccr-v5f2","GHSA-q2c6-c6pm-g3gh","GHSA-q42p-pg8m-cqh6","GHSA-v9jr-rg53-9pgp","ROOT-APP-NPM-CVE-2026-41238","ROOT-APP-NPM-GHSA-2cf5-4w76-r9qv","ROOT-APP-NPM-GHSA-g9r4-xpmj-mj65","ROOT-APP-NPM-GHSA-q2c6-c6pm-g3gh","ROOT-APP-NPM-GHSA-q42p-pg8m-cqh6","UBUNTU-CVE-2026-41238"],"status":"published","title":"DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEMENT_HANDLING Fallback","description":"DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization. Version 3.4.0 fixes the 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Prototype Pollution to XSS Bypass via CUSTOM_ELEMENT_HANDLING Fallback","description":"DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization. Version 3.4.0 fixes the issue.","status":"published","published":"2026-04-23T14:43:17.73Z","modified":"2026-04-23T16:22:34.174Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-79","CWE-1321"],"updated_at":"2026-11-02T13:40:57.334596Z"}],"euvd":[{"id":"EUVD-2026-25236","description":"DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization. Version 3.4.0 fixes the issue.","status":"published","published":"2026-04-23T14:43:17Z","modified":"2026-04-23T16:22:34Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:24:19.171803Z"}],"ghsa":[{"id":"GHSA-2cf5-4w76-r9qv","title":"Arbitrary Code Execution in handlebars","description":"Versions of `handlebars` prior to 3.0.8 or 4.5.2 are vulnerable to Arbitrary Code Execution. The package's lookup helper fails to properly validate templates, allowing attackers to submit templates that execute arbitrary JavaScript in the system. It can be used to run arbitrary code in a server processing Handlebars templates or on a victim's browser (effectively serving as Cross-Site Scripting).\n\nThe following template can be used to demonstrate the vulnerability:  \n```{{#with \"constructor\"}}\n\t{{#with split as |a|}}\n\t\t{{pop (push \"alert('Vulnerable Handlebars JS');\")}}\n\t\t{{#with (concat (lookup join (slice 0 1)))}}\n\t\t\t{{#each (slice 2 3)}}\n\t\t\t\t{{#with (apply 0 a)}}\n\t\t\t\t\t{{.}}\n\t\t\t\t{{/with}}\n\t\t\t{{/each}}\n\t\t{{/with}}\n\t{{/with}}\n{{/with}}```\n\n\n## Recommendation\n\nUpgrade to version 3.0.8, 4.5.2 or later.","status":"published","published":"2020-09-04T14:57:38Z","modified":"2024-02-07T05:08:28Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:L","level":"high"}],"cwes":["CWE-94"],"updated_at":"2026-11-02T14:37:36.076201Z"},{"id":"GHSA-q42p-pg8m-cqh6","title":"Prototype Pollution in handlebars","description":"Versions of `handlebars` prior to 4.0.14 are vulnerable to Prototype Pollution. Templates may alter an Objects' prototype, thus allowing an attacker to execute arbitrary code on the server.\n\n\n## Recommendation\n\nFor handlebars 4.1.x upgrade to 4.1.2 or later.\nFor handlebars 4.0.x upgrade to 4.0.14 or later.","status":"published","published":"2019-06-05T14:07:48Z","modified":"2023-11-29T20:32:55Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"cwes":["CWE-471"],"updated_at":"2026-11-02T14:37:22.840002Z"},{"id":"GHSA-v9jr-rg53-9pgp","title":"DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEMENT_HANDLING Fallback","description":"## Summary\n\nDOMPurify versions 3.0.1 through 3.3.3 (latest) are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization.\n\n## Affected Versions\n\n- **3.0.1 through 3.3.3** (current latest) — all affected\n- **3.0.0 and all 2.x versions** — NOT affected (used `Object.create(null)` for initialization, no `|| {}` reassignment)\n- The vulnerable `|| {}` reassignment was introduced in the 3.0.0→3.0.1 refactor\n- This is **distinct** from GHSA-cj63-jhhr-wcxv (USE_PROFILES Array.prototype pollution, fixed in 3.3.2)\n- This is **distinct** from CVE-2024-45801 / GHSA-mmhx-hmjr-r674 (__depth prototype pollution, fixed in 3.1.3)\n\n## Root Cause\n\nIn `purify.js` at line 590, during config parsing:\n\n```javascript\nCUSTOM_ELEMENT_HANDLING = cfg.CUSTOM_ELEMENT_HANDLING || {};\n```\n\nWhen no `CUSTOM_ELEMENT_HANDLING` is specified in the config (the default usage pattern), `cfg.CUSTOM_ELEMENT_HANDLING` is `undefined`, and the fallback `{}` is used. This plain object inherits from `Object.prototype`.\n\nLines 591-598 then check `cfg.CUSTOM_ELEMENT_HANDLING` (the original config property) — which is `undefined` — so the conditional blocks that would set `tagNameCheck` and `attributeNameCheck` from the config are never entered.\n\nAs a result, `CUSTOM_ELEMENT_HANDLING.tagNameCheck` and `CUSTOM_ELEMENT_HANDLING.attributeNameCheck` resolve via the prototype chain. If an attacker has polluted `Object.prototype.tagNameCheck` and `Object.prototype.attributeNameCheck` with permissive values (e.g., `/.*/`), these polluted values flow into DOMPurify's custom element validation at lines 973-977 and attribute validation, causing all custom elements and all attributes to be allowed.\n\n## Impact\n\n- **Attack type:** XSS bypass via prototype pollution chain\n- **Prerequisites:** Attacker must have a prototype pollution primitive in the same execution context (e.g., vulnerable version of lodash, jQuery.extend, query-string parser, deep merge utility, or any other PP gadget)\n- **Config required:** Default. No special DOMPurify configuration needed. The standard `DOMPurify.sanitize(userInput)` call is affected.\n- **Payload:** Any HTML custom element (name containing a hyphen) with event handler attributes survives sanitization\n\n## Proof of Concept\n\n```javascript\n// Step 1: Attacker exploits a prototype pollution gadget elsewhere in the application\nObject.prototype.tagNameCheck = /.*/;\nObject.prototype.attributeNameCheck = /.*/;\n\n// Step 2: Application sanitizes user input with DEFAULT config\nconst clean = DOMPurify.sanitize('\u003cx-x onfocus=alert(document.cookie) tabindex=0 autofocus\u003e');\n\n// Step 3: \"Sanitized\" output still contains the event handler\nconsole.log(clean);\n// Output: \u003cx-x onfocus=\"alert(document.cookie)\" tabindex=\"0\" autofocus=\"\"\u003e\n\n// Step 4: When injected into DOM, XSS executes\ndocument.body.innerHTML = clean; // alert() fires\n```\n\n### Tested configurations that are vulnerable:\n\n| Call Pattern | Vulnerable? |\n|---|---|\n| `DOMPurify.sanitize(input)` | YES |\n| `DOMPurify.sanitize(input, {})` | YES |\n| `DOMPurify.sanitize(input, { CUSTOM_ELEMENT_HANDLING: null })` | YES |\n| `DOMPurify.sanitize(input, { CUSTOM_ELEMENT_HANDLING: {} })` | NO (explicit object triggers L591 path) |\n\n## Suggested Fix\n\nChange line 590 from:\n```javascript\nCUSTOM_ELEMENT_HANDLING = cfg.CUSTOM_ELEMENT_HANDLING || {};\n```\n\nTo:\n```javascript\nCUSTOM_ELEMENT_HANDLING = cfg.CUSTOM_ELEMENT_HANDLING || create(null);\n```\n\nThe `create(null)` function (already used elsewhere in DOMPurify, e.g., in `clone()`) creates an object with no prototype, preventing prototype chain inheritance.\n\n### Alternative application-level mitigation:\n\nApplications can protect themselves by always providing an explicit `CUSTOM_ELEMENT_HANDLING` in their config:\n\n```javascript\nDOMPurify.sanitize(input, {\n  CUSTOM_ELEMENT_HANDLING: {\n    tagNameCheck: null,\n    attributeNameCheck: null\n  }\n});\n```\n\n## Timeline\n\n- **2026-04-04:** Vulnerability discovered during automated DOMPurify fuzzing research (Fermat project)\n- **2026-04-04:** Confirmed in Chrome browser with DOMPurify 3.3.3\n- **2026-04-04:** Verified distinct from GHSA-cj63-jhhr-wcxv and CVE-2024-45801\n- **2026-04-04:** Advisory drafted, responsible disclosure initiated\n\n## Credit\n\nhttps://github.com/trace37labs","status":"published","published":"2026-04-22T17:31:32Z","modified":"2026-04-27T16:32:04Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N","level":"medium"}],"cwes":["CWE-79","CWE-1321"],"updated_at":"2026-11-02T14:39:58.897998Z"},{"id":"GHSA-g9r4-xpmj-mj65","title":"Prototype Pollution in handlebars","description":"Versions of `handlebars` prior to 3.0.8 or 4.5.3 are vulnerable to prototype pollution. It is possible to add or modify properties to the Object prototype through a malicious template. This may allow attackers to crash the application or execute Arbitrary Code in specific conditions.\n\n\n## Recommendation\n\nUpgrade to version 3.0.8, 4.5.3 or later.","status":"published","published":"2020-09-04T15:06:32Z","modified":"2023-01-09T05:04:02Z","cwes":["CWE-1321"],"updated_at":"2026-11-02T14:36:08.267721Z"},{"id":"GHSA-q2c6-c6pm-g3gh","title":"Arbitrary Code Execution in handlebars","description":"Versions of `handlebars` prior to 3.0.8 or 4.5.3 are vulnerable to Arbitrary Code Execution. The package's lookup helper fails to properly validate templates, allowing attackers to submit templates that execute arbitrary JavaScript in the system. It is due to an incomplete fix for a [previous issue](https://www.npmjs.com/advisories/1316). This vulnerability can be used to run arbitrary code in a server processing Handlebars templates or on a victim's browser (effectively serving as Cross-Site Scripting).\n\n\n## Recommendation\n\nUpgrade to version 3.0.8, 4.5.3 or later.","status":"published","published":"2020-09-04T15:07:38Z","modified":"2023-01-09T05:04:24Z","updated_at":"2026-11-02T14:36:09.554044Z"}],"nvd":[{"id":"CVE-2026-41238","description":"DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization. Version 3.4.0 fixes the issue.","status":"published","published":"2026-04-23T16:16:26.42Z","modified":"2026-10-26T22:10:00.163Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-79","CWE-1321"],"updated_at":"2026-11-02T14:12:15.867234Z"}],"osv":[{"id":"CVE-2026-41238","title":"DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEMENT_HANDLING Fallback","description":"DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization. Version 3.4.0 fixes the issue.","status":"published","published":"2026-04-23T14:43:17.73Z","modified":"2026-10-28T02:30:55.073347345Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N","level":"medium"}],"cwes":["CWE-1321","CWE-79"],"updated_at":"2026-11-02T15:45:03.764807Z"},{"id":"DEBIAN-CVE-2026-41238","description":"DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization. Version 3.4.0 fixes the issue.","status":"published","published":"2026-04-23T16:16:26.42Z","modified":"2026-10-27T09:47:39.324780345Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:54.892385Z"},{"id":"GHSA-2cf5-4w76-r9qv","title":"Arbitrary Code Execution in handlebars","description":"Versions of `handlebars` prior to 3.0.8 or 4.5.2 are vulnerable to Arbitrary Code Execution. The package's lookup helper fails to properly validate templates, allowing attackers to submit templates that execute arbitrary JavaScript in the system. It can be used to run arbitrary code in a server processing Handlebars templates or on a victim's browser (effectively serving as Cross-Site Scripting).\n\nThe following template can be used to demonstrate the vulnerability:  \n```{{#with \"constructor\"}}\n\t{{#with split as |a|}}\n\t\t{{pop (push \"alert('Vulnerable Handlebars JS');\")}}\n\t\t{{#with (concat (lookup join (slice 0 1)))}}\n\t\t\t{{#each (slice 2 3)}}\n\t\t\t\t{{#with (apply 0 a)}}\n\t\t\t\t\t{{.}}\n\t\t\t\t{{/with}}\n\t\t\t{{/each}}\n\t\t{{/with}}\n\t{{/with}}\n{{/with}}```\n\n\n## Recommendation\n\nUpgrade to version 3.0.8, 4.5.2 or later.","status":"published","published":"2020-09-04T14:57:38Z","modified":"2026-09-10T03:48:33.174881747Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:L/I:H/A:L","level":"high"}],"cwes":["CWE-94"],"updated_at":"2026-11-02T15:46:34.338541Z"},{"id":"GHSA-q42p-pg8m-cqh6","title":"Prototype Pollution in handlebars","description":"Versions of `handlebars` prior to 4.0.14 are vulnerable to Prototype Pollution. Templates may alter an Objects' prototype, thus allowing an attacker to execute arbitrary code on the server.\n\n\n## Recommendation\n\nFor handlebars 4.1.x upgrade to 4.1.2 or later.\nFor handlebars 4.0.x upgrade to 4.0.14 or later.","status":"published","published":"2019-06-05T14:07:48Z","modified":"2026-09-10T03:48:23.648231681Z","cvss":[{"version":"3.1","score":7.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","level":"high"}],"cwes":["CWE-471"],"updated_at":"2026-11-02T15:46:54.055966Z"},{"id":"GHSA-v9jr-rg53-9pgp","title":"DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEMENT_HANDLING Fallback","description":"## Summary\n\nDOMPurify versions 3.0.1 through 3.3.3 (latest) are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization.\n\n## Affected Versions\n\n- **3.0.1 through 3.3.3** (current latest) — all affected\n- **3.0.0 and all 2.x versions** — NOT affected (used `Object.create(null)` for initialization, no `|| {}` reassignment)\n- The vulnerable `|| {}` reassignment was introduced in the 3.0.0→3.0.1 refactor\n- This is **distinct** from GHSA-cj63-jhhr-wcxv (USE_PROFILES Array.prototype pollution, fixed in 3.3.2)\n- This is **distinct** from CVE-2024-45801 / GHSA-mmhx-hmjr-r674 (__depth prototype pollution, fixed in 3.1.3)\n\n## Root Cause\n\nIn `purify.js` at line 590, during config parsing:\n\n```javascript\nCUSTOM_ELEMENT_HANDLING = cfg.CUSTOM_ELEMENT_HANDLING || {};\n```\n\nWhen no `CUSTOM_ELEMENT_HANDLING` is specified in the config (the default usage pattern), `cfg.CUSTOM_ELEMENT_HANDLING` is `undefined`, and the fallback `{}` is used. This plain object inherits from `Object.prototype`.\n\nLines 591-598 then check `cfg.CUSTOM_ELEMENT_HANDLING` (the original config property) — which is `undefined` — so the conditional blocks that would set `tagNameCheck` and `attributeNameCheck` from the config are never entered.\n\nAs a result, `CUSTOM_ELEMENT_HANDLING.tagNameCheck` and `CUSTOM_ELEMENT_HANDLING.attributeNameCheck` resolve via the prototype chain. If an attacker has polluted `Object.prototype.tagNameCheck` and `Object.prototype.attributeNameCheck` with permissive values (e.g., `/.*/`), these polluted values flow into DOMPurify's custom element validation at lines 973-977 and attribute validation, causing all custom elements and all attributes to be allowed.\n\n## Impact\n\n- **Attack type:** XSS bypass via prototype pollution chain\n- **Prerequisites:** Attacker must have a prototype pollution primitive in the same execution context (e.g., vulnerable version of lodash, jQuery.extend, query-string parser, deep merge utility, or any other PP gadget)\n- **Config required:** Default. No special DOMPurify configuration needed. The standard `DOMPurify.sanitize(userInput)` call is affected.\n- **Payload:** Any HTML custom element (name containing a hyphen) with event handler attributes survives sanitization\n\n## Proof of Concept\n\n```javascript\n// Step 1: Attacker exploits a prototype pollution gadget elsewhere in the application\nObject.prototype.tagNameCheck = /.*/;\nObject.prototype.attributeNameCheck = /.*/;\n\n// Step 2: Application sanitizes user input with DEFAULT config\nconst clean = DOMPurify.sanitize('\u003cx-x onfocus=alert(document.cookie) tabindex=0 autofocus\u003e');\n\n// Step 3: \"Sanitized\" output still contains the event handler\nconsole.log(clean);\n// Output: \u003cx-x onfocus=\"alert(document.cookie)\" tabindex=\"0\" autofocus=\"\"\u003e\n\n// Step 4: When injected into DOM, XSS executes\ndocument.body.innerHTML = clean; // alert() fires\n```\n\n### Tested configurations that are vulnerable:\n\n| Call Pattern | Vulnerable? |\n|---|---|\n| `DOMPurify.sanitize(input)` | YES |\n| `DOMPurify.sanitize(input, {})` | YES |\n| `DOMPurify.sanitize(input, { CUSTOM_ELEMENT_HANDLING: null })` | YES |\n| `DOMPurify.sanitize(input, { CUSTOM_ELEMENT_HANDLING: {} })` | NO (explicit object triggers L591 path) |\n\n## Suggested Fix\n\nChange line 590 from:\n```javascript\nCUSTOM_ELEMENT_HANDLING = cfg.CUSTOM_ELEMENT_HANDLING || {};\n```\n\nTo:\n```javascript\nCUSTOM_ELEMENT_HANDLING = cfg.CUSTOM_ELEMENT_HANDLING || create(null);\n```\n\nThe `create(null)` function (already used elsewhere in DOMPurify, e.g., in `clone()`) creates an object with no prototype, preventing prototype chain inheritance.\n\n### Alternative application-level mitigation:\n\nApplications can protect themselves by always providing an explicit `CUSTOM_ELEMENT_HANDLING` in their config:\n\n```javascript\nDOMPurify.sanitize(input, {\n  CUSTOM_ELEMENT_HANDLING: {\n    tagNameCheck: null,\n    attributeNameCheck: null\n  }\n});\n```\n\n## Timeline\n\n- **2026-04-04:** Vulnerability discovered during automated DOMPurify fuzzing research (Fermat project)\n- **2026-04-04:** Confirmed in Chrome browser with DOMPurify 3.3.3\n- **2026-04-04:** Verified distinct from GHSA-cj63-jhhr-wcxv and CVE-2024-45801\n- **2026-04-04:** Advisory drafted, responsible disclosure initiated\n\n## Credit\n\nhttps://github.com/trace37labs","status":"published","published":"2026-04-22T17:31:32Z","modified":"2026-09-10T03:51:03.414330043Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N","level":"medium"}],"cwes":["CWE-1321","CWE-79"],"updated_at":"2026-11-02T15:46:56.981655Z"},{"id":"UBUNTU-CVE-2026-41238","description":"DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization. Version 3.4.0 fixes the issue.","status":"published","published":"2026-04-23T16:16:00Z","modified":"2026-10-17T13:00:03.881735205Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:16.686388Z"},{"id":"CLSA-2026-1774743817","title":"TuxCare security update for handlebars (1 CVE)","description":"TuxCare rebuilt handlebars to address 1 CVE. Fixed in 1.3.0-tuxcare.1.","status":"published","published":"2026-08-04T14:52:15Z","modified":"2026-10-15T09:47:48.668758728Z","updated_at":"2026-11-02T15:43:43.621843Z"},{"id":"CLSA-2026-1774743830","title":"TuxCare security update for handlebars (3 CVEs)","description":"TuxCare rebuilt handlebars to address 3 CVEs. Fixed in 1.0.12-tuxcare.2.","status":"published","published":"2026-08-04T14:52:16Z","modified":"2026-10-23T19:28:13.663406058Z","updated_at":"2026-11-02T15:43:43.621843Z"},{"id":"CLSA-2026-1778546719","title":"TuxCare security update for dompurify (6 CVEs)","description":"TuxCare rebuilt dompurify to address 6 CVEs. Fixed in 3.1.6-tuxcare.3.","status":"published","published":"2026-08-04T14:52:31Z","modified":"2026-10-15T09:45:30.926676898Z","updated_at":"2026-11-02T15:43:44.737408Z"},{"id":"CLSA-2026-1778805976","title":"TuxCare security update for dompurify (10 CVEs)","description":"TuxCare rebuilt dompurify to address 10 CVEs. Fixed in 3.2.3-tuxcare.1.","status":"published","published":"2026-08-04T14:52:31Z","modified":"2026-10-15T09:45:31.523670706Z","updated_at":"2026-11-02T15:43:44.737408Z"},{"id":"CLSA-2026-1780274966","title":"TuxCare security update for dompurify (10 CVEs)","description":"TuxCare rebuilt dompurify to address 10 CVEs. Fixed in 3.0.3-tuxcare.1.","status":"published","published":"2026-08-04T14:52:34Z","modified":"2026-10-15T09:48:03.584932787Z","updated_at":"2026-11-02T15:43:45.090939Z"},{"id":"CLSA-2026-1786731948","title":"TuxCare security update for dompurify (34 CVEs)","description":"TuxCare rebuilt dompurify to address 34 CVEs. Fixed in 3.0.3-tuxcare.1.","status":"withdrawn","published":"2026-08-14T18:25:48Z","modified":"2026-10-26T13:21:31Z","updated_at":"2026-11-02T15:43:47.20725Z"},{"id":"CLSA-2026-1787602198","title":"TuxCare security update for dompurify (10 CVEs)","description":"TuxCare rebuilt dompurify to address 10 CVEs. Fixed in 3.2.7-tuxcare.1.","status":"published","published":"2026-08-24T20:09:58Z","modified":"2026-10-15T09:48:03.099706625Z","updated_at":"2026-11-02T15:43:47.20725Z"},{"id":"CLSA-2026-1792155851","title":"TuxCare security update for dompurify (12 CVEs)","description":"TuxCare rebuilt dompurify to address 12 CVEs. Fixed in 3.1.3-tuxcare.2.","status":"published","published":"2026-10-16T13:04:11Z","modified":"2026-10-21T20:43:23.163914038Z","updated_at":"2026-11-02T15:43:50.949147Z"},{"id":"CLSA-2026-1792156267","title":"TuxCare security update for dompurify (9 CVEs)","description":"TuxCare rebuilt dompurify to address 9 CVEs. Fixed in 3.1.2-tuxcare.2.","status":"published","published":"2026-10-16T13:11:07Z","modified":"2026-10-21T20:43:22.742858668Z","updated_at":"2026-11-02T15:43:50.949147Z"},{"id":"CLSA-2026-1792156282","title":"TuxCare security update for dompurify (11 CVEs)","description":"TuxCare rebuilt dompurify to address 11 CVEs. Fixed in 3.1.4-tuxcare.2.","status":"published","published":"2026-10-16T13:11:22Z","modified":"2026-10-21T20:43:22.552871845Z","updated_at":"2026-11-02T15:43:50.949147Z"},{"id":"CLSA-2026-1792156382","title":"TuxCare security update for dompurify (9 CVEs)","description":"TuxCare rebuilt dompurify to address 9 CVEs. Fixed in 3.0.2-tuxcare.2.","status":"published","published":"2026-10-16T13:13:02Z","modified":"2026-10-21T20:43:22.190952605Z","updated_at":"2026-11-02T15:43:50.949147Z"},{"id":"CLSA-2026-1792156694","title":"TuxCare security update for dompurify (11 CVEs)","description":"TuxCare rebuilt dompurify to address 11 CVEs. Fixed in 3.0.8-tuxcare.2.","status":"published","published":"2026-10-16T13:18:14Z","modified":"2026-10-21T20:43:18.588659369Z","updated_at":"2026-11-02T15:43:50.949147Z"},{"id":"CLSA-2026-1792157013","title":"TuxCare security update for dompurify (13 CVEs)","description":"TuxCare rebuilt dompurify to address 13 CVEs. Fixed in 3.1.0-tuxcare.2.","status":"published","published":"2026-10-16T13:23:33Z","modified":"2026-10-21T20:43:22.452640022Z","updated_at":"2026-11-02T15:43:50.949147Z"},{"id":"CLSA-2026-1792157113","title":"TuxCare security update for dompurify (12 CVEs)","description":"TuxCare rebuilt dompurify to address 12 CVEs. Fixed in 3.0.11-tuxcare.2.","status":"published","published":"2026-10-16T13:25:13Z","modified":"2026-10-21T20:43:21.625485698Z","updated_at":"2026-11-02T15:43:50.949147Z"},{"id":"CLSA-2026-1792369452","title":"TuxCare security update for dompurify (6 CVEs)","description":"TuxCare rebuilt dompurify to address 6 CVEs. Fixed in 3.0.6-tuxcare.3.","status":"published","published":"2026-10-19T00:24:12Z","modified":"2026-10-19T07:45:38.150098133Z","updated_at":"2026-11-02T15:43:53.353888Z"},{"id":"CLSA-2026-1792424561","title":"TuxCare security update for dompurify (9 CVEs)","description":"TuxCare rebuilt dompurify to address 9 CVEs. Fixed in 3.3.3-tuxcare.3.","status":"published","published":"2026-10-19T15:42:41Z","modified":"2026-10-19T19:15:12.229054081Z","updated_at":"2026-11-02T15:43:54.119956Z"},{"id":"CLSA-2026-1792424669","title":"TuxCare security update for dompurify (9 CVEs)","description":"TuxCare rebuilt dompurify to address 9 CVEs. Fixed in 3.2.6-tuxcare.3.","status":"published","published":"2026-10-19T15:44:29Z","modified":"2026-10-19T19:15:02.915010976Z","updated_at":"2026-11-02T15:43:54.119956Z"},{"id":"CLSA-2026-1792453557","title":"TuxCare security update for dompurify (5 CVEs)","description":"TuxCare rebuilt dompurify to address 5 CVEs. Fixed in 3.0.5-tuxcare.2.","status":"published","published":"2026-10-19T23:45:57Z","modified":"2026-10-20T01:45:14.102972225Z","updated_at":"2026-11-02T15:43:54.378946Z"},{"id":"CLSA-2026-1792479087","title":"TuxCare security update for dompurify (5 CVEs)","description":"TuxCare rebuilt dompurify to address 5 CVEs. Fixed in 3.0.4-tuxcare.2.","status":"published","published":"2026-10-20T06:51:27Z","modified":"2026-10-20T13:45:06.956605427Z","updated_at":"2026-11-02T15:43:54.378946Z"},{"id":"CLSA-2026-1792486117","title":"TuxCare security update for dompurify (10 CVEs)","description":"TuxCare rebuilt dompurify to address 10 CVEs. Fixed in 3.0.1-tuxcare.3.","status":"published","published":"2026-10-20T08:48:37Z","modified":"2026-10-20T13:45:03.966154445Z","updated_at":"2026-11-02T15:43:54.378946Z"},{"id":"CLSA-2026-1792496766","title":"TuxCare security update for dompurify (9 CVEs)","description":"TuxCare rebuilt dompurify to address 9 CVEs. Fixed in 3.0.9-tuxcare.3.","status":"published","published":"2026-10-20T11:46:06Z","modified":"2026-10-20T13:45:21.73707763Z","updated_at":"2026-11-02T15:43:54.378946Z"},{"id":"CLSA-2026-1792594075","title":"TuxCare security update for dompurify (11 CVEs)","description":"TuxCare rebuilt dompurify to address 11 CVEs. Fixed in 3.1.1-tuxcare.3.","status":"published","published":"2026-10-21T14:47:55Z","modified":"2026-10-21T20:31:56.603365391Z","updated_at":"2026-11-02T15:43:54.672859Z"},{"id":"GHSA-g9r4-xpmj-mj65","title":"Prototype Pollution in handlebars","description":"Versions of `handlebars` prior to 3.0.8 or 4.5.3 are vulnerable to prototype pollution. It is possible to add or modify properties to the Object prototype through a malicious template. This may allow attackers to crash the application or execute Arbitrary Code in specific conditions.\n\n\n## Recommendation\n\nUpgrade to version 3.0.8, 4.5.3 or later.","status":"published","published":"2020-09-04T15:06:32Z","modified":"2026-09-10T03:49:13.649783342Z","cwes":["CWE-1321"],"updated_at":"2026-11-02T15:46:47.472172Z"},{"id":"GHSA-q2c6-c6pm-g3gh","title":"Arbitrary Code Execution in handlebars","description":"Versions of `handlebars` prior to 3.0.8 or 4.5.3 are vulnerable to Arbitrary Code Execution. The package's lookup helper fails to properly validate templates, allowing attackers to submit templates that execute arbitrary JavaScript in the system. It is due to an incomplete fix for a [previous issue](https://www.npmjs.com/advisories/1316). This vulnerability can be used to run arbitrary code in a server processing Handlebars templates or on a victim's browser (effectively serving as Cross-Site Scripting).\n\n\n## Recommendation\n\nUpgrade to version 3.0.8, 4.5.3 or later.","status":"published","published":"2020-09-04T15:07:38Z","modified":"2026-09-10T03:48:58.277710865Z","updated_at":"2026-11-02T15:46:53.700556Z"},{"id":"ROOT-APP-NPM-CVE-2026-41238","title":"CVE-2026-41238 in dompurify - Patched by Root","description":"Root has patched CVE-2026-41238 in the dompurify package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-10-28T04:55:46Z","modified":"2026-10-28T05:15:04.110276261Z","updated_at":"2026-11-02T15:53:27.649662Z"},{"id":"ROOT-APP-NPM-GHSA-2cf5-4w76-r9qv","title":"GHSA-2cf5-4w76-r9qv in handlebars - Patched by Root","description":"Root has patched GHSA-2cf5-4w76-r9qv in the handlebars package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-10-20T10:47:36Z","modified":"2026-10-20T11:15:38.540557189Z","updated_at":"2026-11-02T15:53:27.940619Z"},{"id":"ROOT-APP-NPM-GHSA-g9r4-xpmj-mj65","title":"GHSA-g9r4-xpmj-mj65 in handlebars - Patched by Root","description":"Root has patched GHSA-g9r4-xpmj-mj65 in the handlebars package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-10-20T10:47:36Z","modified":"2026-10-20T11:15:39.391242933Z","updated_at":"2026-11-02T15:53:27.940619Z"},{"id":"ROOT-APP-NPM-GHSA-q2c6-c6pm-g3gh","title":"GHSA-q2c6-c6pm-g3gh in handlebars - Patched by Root","description":"Root has patched GHSA-q2c6-c6pm-g3gh in the handlebars package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-10-20T10:47:36Z","modified":"2026-10-20T11:15:37.928892011Z","updated_at":"2026-11-02T15:53:27.940619Z"},{"id":"ROOT-APP-NPM-GHSA-q42p-pg8m-cqh6","title":"GHSA-q42p-pg8m-cqh6 in handlebars - Patched by Root","description":"Root has patched GHSA-q42p-pg8m-cqh6 in the handlebars package for Root:npm. Multiple fixed versions available.","status":"published","published":"2026-10-20T10:47:36Z","modified":"2026-10-20T11:15:37.540463486Z","updated_at":"2026-11-02T15:53:27.940619Z"}]}}