CVE-2026-63762: surrealdb Null Dereference — Fix

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. The issue was fixed by updating the rquickjs dependency from v0.9.0 to v0.11.0.

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CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0025

Probability of exploitation

0.17%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
surrealdb	surrealdb	< 2.6.1
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All
surrealdb	surrealdb	All

References

Advisories & Patches

https://github.com/surrealdb/surrealdb/security/advisories/GHSA-xx7m-69ff-9crp

Other References

https://www.vulncheck.com/advisories/surrealdb-before-denial-of-service-via-scripting

Frequently Asked Questions

What is CVE-2026-63762? +

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. The issue was fixed by updating the rquickjs dependency from v0.9.0 to v0.11.0. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-63762? +

CVE-2026-63762 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0025, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-63762? +

CVE-2026-63762 affects products from surrealdb, specifically: surrealdb. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-63762? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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