{"id":"EUVD-2026-45933","revision":null,"records":[{"revision":"9b4ca2adf50b41faac8a41cfd44e78be","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-63762","aliases":[],"title":"SurrealDB before v2.6.1 Denial of Service via scripting","description":"SurrealDB before v2.6.1 (and before v3.0.0-beta.3) contains a denial of service vulnerability in its embedded JavaScript scripting engine, which is enabled via the --allow-scripting capability (disabled by default). Any user able to execute arbitrary queries — including unauthenticated guests when --allow-guests is enabled — can use built-in string functions to construct a large string and pass it to the JavaScript runtime for compilation, triggering a null pointer dereference in the underlying QuickJS-NG engine. This causes the server process to terminate immediately without graceful shutdown, requiring a manual restart. 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The exact string size required to trigger the crash varies between SurrealDB versions.\n\nWhilst exploiting the vulnerability requires users to be able to run arbitrary queries, if guest access (`--allow-guests`), is enabled, then guests can perform this attack.\n\n### Impact\n\nAny user able to execute queries on a SurrealDB instance with scripting enabled (`--allow-scripting`) can cause complete denial of service. The server process terminates immediately without graceful shutdown.\n\nThe underlying cause of the vulnerability is a null pointer dereference in the `QuickJS-NG` v0.8 JavaScript engine, this vulnerability cannot be exploited to execute arbitrary code, or compromise the integrity or confidentiality of data. \n\n### Patches\n\nVersions prior to SurrealDB `v2.6.1` and `v3.0.0-beta.3` are vulnerable.\n\nThe patches for SurrealDB `v2.6.1` and `v3.0.0-beta.3` update the `rquickjs` dependency from `v0.9.0` to `v0.11.0`, which in turn uses an updated version of `QuickJS-NG`.\n\n### Workarounds\nDeny execution of embedded scripting functions through the configuration of [capabilities](https://surrealdb.com/docs/surrealdb/security/capabilities#capabilities) by starting SurrealDB with the `--deny-scripting` flag or the equivalent environment variable `SURREAL_CAPS_DENY_SCRIPT=true`. This has a usability implication, although scripting functions are disabled by default.\n\nAdministrators can also use `--deny-arbitrary-query`  to deny arbitrary querying by either `guest`, `record` or `system` users, or a combination of those, with impacts to functionality for those users. \n\n### Links ###\n[SurrealDB Documentation - Capabilities](https://surrealdb.com/docs/surrealdb/security/capabilities)\n[SurrealDB Documentation - Guest Access](https://surrealdb.com/docs/surrealdb/security/capabilities#guest-access)\n[SurrealQL Documentation - Scripting Functions](https://surrealdb.com/docs/surrealql/functions/script)\n[quickjs-ng v0.9 Release Notes](https://github.com/quickjs-ng/quickjs/releases/tag/v0.9.0)\nhttps://github.com/surrealdb/surrealdb/pull/6833\nhttps://github.com/surrealdb/surrealdb/pull/6774","state":0,"publishedAt":"2026-02-12T22:11:48+00:00","modifiedAt":"2026-07-21T03:56:46.9884075+00:00","affected":[{"ecosystem":"crates.io","name":"surrealdb","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.6.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"crates.io","name":"surrealdb","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"3.0.0-alpha.8"},{"kind":"fixed","version":"3.0.0-beta.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/surrealdb/surrealdb/security/advisories/GHSA-xx7m-69ff-9crp","https://github.com/surrealdb/surrealdb/pull/6774","https://github.com/surrealdb/surrealdb/pull/6833","https://github.com/surrealdb/surrealdb/commit/2b0389b92398d9ecff4632cd51bbf8303832a988","https://github.com/surrealdb/surrealdb/commit/bcd2ece9ef0d721215f06a47280698669f332285","https://github.com/surrealdb/surrealdb"],"sourceUrl":"https://github.com/advisories/GHSA-xx7m-69ff-9crp","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-xx7m-69ff-9crp","identifiers":["GHSA-xx7m-69ff-9crp","CVE-2026-63762"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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