{"id":"CVE-2026-54314","title":"n8n: Denial of Service via ZIP decompression in webhook workflow","summary":"n8n: Denial of Service via ZIP decompression in webhook workflow","severity":"medium","cvss":5.9,"cwe":["CWE-409"],"vendor":"n8n","product":"n8n","ecosystem":"npm","affected":["n8n < 2.24.0"],"patched":["n8n 2.24.0"],"published":"2026-06-16","updated":"2026-06-16","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-jqpw-qww5-cj4c","references":[{"url":"https://github.com/n8n-io/n8n/security/advisories/GHSA-jqpw-qww5-cj4c"},{"url":"https://github.com/advisories/GHSA-jqpw-qww5-cj4c"}],"tags":["ghsa","npm"],"epss":0.00546,"epssPercentile":0.44687,"ingestedAt":"2026-06-29T14:31:47.472Z","slug":"CVE-2026-54314","body":"## Overview\n\n## Impact\nThe Compression node's Decompress operation expanded attacker-controlled archives into memory without enforcing limits on decompressed output size. An unauthenticated attacker could send a small compressed archive to a public webhook workflow using this node, causing the n8n process to terminate due to memory exhaustion and disrupting all workflows in the same instance. \n\n## Patches\nThe issue has been fixed in n8n version 2.24.0. Users should upgrade to this version or later to remediate the vulnerability. The fix introduces configurable limits on decompressed output size (`N8N_COMPRESSION_NODE_MAX_DECOMPRESSED_SIZE_BYTES`) and ZIP entry count (`N8N_COMPRESSION_NODE_MAX_ZIP_ENTRIES`).\n\n## Workarounds\nIf upgrading is not immediately possible, administrators should consider the following temporary mitigations:\n- Disable the Compression node by adding `n8n-nodes-base.compression` to the `NODES_EXCLUDE` environment variable.\n- Restrict public webhook workflows that accept archive file uploads to authenticated endpoints only.\n\nThese workarounds do not fully remediate the risk and should only be used as short-term mitigation measures.\n\n## Affected packages\n\n- `n8n < 2.24.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `n8n 2.24.0`","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}