Nextcloud End-to-End Encryption before 1.5.3, 1.6.3 and 1.7.1 suffers from a denial of service vulnerability due to permitting any authentic

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• nextcloud end-to-end encryptionbefore 1.5.3
• nextcloud end-to-end encryption1.6.0 and later · before 1.6.3
• nextcloud end-to-end encryption1.7.0 and later · before 1.7.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (hackerone). Independent of NVD's CPE analysis and usually ahead of it.

• n/a Nextcloud End-to-End Encryption

  • Fixed in 1.5.3, 1.6.3, 1.7.1affected

Other highest-scoring records for the same primary product.

• CVE-2023-35173End-to-End encrypted file-drops can be made inaccessible
  26Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1function expand(node) {2  return node.children.map(expand);3}

1const MAX_DEPTH = 32;2function expand(node, depth = 0) {3  if (depth > MAX_DEPTH) throw new Error("too deep");4  return node.children.map((c) => expand(c, depth + 1));5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.