{"id":"CVE-2026-33508","aliases":["BIT-parse-2026-33508","GHSA-6qh5-m6g3-xhq6"],"url":"https://o3.security/vulnerability/CVE-2026-33508","summary":"Parse Server: LiveQuery subscription query depth bypass","details":"### Impact\n\nParse Server's LiveQuery component does not enforce the `requestComplexity.queryDepth` configuration setting when processing WebSocket subscription requests. An attacker can send a subscription with deeply nested logical operators, causing excessive recursion and CPU consumption that degrades or disrupts service availability.\n\nDeployments are affected when the LiveQuery WebSocket endpoint is reachable by untrusted clients.\n\n### Patches\n\nThe fix adds query condition depth validation to the LiveQuery subscription handler, enforcing the same `requestComplexity.queryDepth` limit that already protects REST API queries.\n\n### Workarounds\n\nThere is no known workaround other than upgrading.","published":"2026-03-24T18:21:08.477Z","modified":"2026-10-28T02:30:56.951125410Z","cvss":null,"epss":{"score":0.00345,"percentile":0.27726,"asOf":"2026-08-21"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"parse-server","fixedVersion":"9.6.0-alpha.45"},{"ecosystem":"npm","name":"parse-server","fixedVersion":"8.6.56"}],"fix":{"url":"https://github.com/parse-community/parse-server/commit/060d27053fb0fadf613c25aabab7fe0c82b7a899","label":"parse-community/parse-server@060d270"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33508.json"},{"type":"ADVISORY","url":"https://github.com/parse-community/parse-server/security/advisories/GHSA-6qh5-m6g3-xhq6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33508"},{"type":"FIX","url":"https://github.com/parse-community/parse-server/commit/060d27053fb0fadf613c25aabab7fe0c82b7a899"},{"type":"FIX","url":"https://github.com/parse-community/parse-server/commit/2126fe4e12f9b399dc6b4b6a3fa70cb1825f159b"},{"type":"FIX","url":"https://github.com/parse-community/parse-server/pull/10259"},{"type":"FIX","url":"https://github.com/parse-community/parse-server/pull/10260"},{"type":"PACKAGE","url":"https://github.com/parse-community/parse-server"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:56.951125410Z"}}