Affected: cure53 DOMPurify

DOMPurify 3.1.3 through 3.2.6 and 2.5.3 through 2.5.8 contain a cross-site scripting vulnerability that allows attackers to bypass attribute sanitization by exploiting missing textarea rawtext element validation in the SAFE_FOR_XML regex. Attackers can include closing rawtext tags like </textarea> in attribute values to break out of rawtext contexts and execute JavaScript when sanitized output is placed inside rawtext elements. The 3.x branch was fixed in 3.2.7; the 2.x branch was never patched.

Affected: npm: node-forge

## Summary

`pki.verifyCertificateChain()` does not enforce RFC 5280 basicConstraints requirements when an intermediate certificate lacks both the `basicConstraints` and `keyUsage` extensions. This allows any leaf certificate (without these extensions) to act as a CA and sign other certificates, which node-forge will accept as valid.

## Technical Details

In `lib/x509.js`, the `verifyCertificateChain()` function (around lines 3147-3199) has two conditional checks for CA authorization:

1. The `keyUsage` check (which includes a sub-check requiring `basicConstraints` to be present) is gated on `keyUsageExt !== null` 2. The `basicConstraints.cA` check is gated on `bcExt !== null`

When a certificate has **neither** extension, both checks are skipped entirely. The certificate passes all CA validation and is accepted as a valid intermediate CA.

**RFC 5280 Section 6.1.4 step (k) requires:** > "If certificate i is a version 3 certificate, verify that the basicConstraints extension is present and that cA is set to TRUE."

The absence of `basicConstraints` should result in rejection, not acceptance.

## Proof of Concept

```javascript const forge = require('node-forge'); const pki = forge.pki;

function generateKeyPair() { return pki.rsa.generateKeyPair({ bits: 2048, e: 0x10001 }); }

console.log('=== node-forge basicConstraints Bypass PoC ===\n');

// 1. Create a legitimate Root CA (self-signed, with basicConstraints cA=true) const rootKeys = generateKeyPair(); const rootCert =…