Vulnerability Description
Kysely is a type-safe TypeScript SQL query builder. From 0.26.0 to 0.28.16, DefaultQueryCompiler.visitJSONPathLeg does not escape JSON-path metacharacters (., [, ], *, **, ?). When attacker-controlled input flows into eb.ref(col, '->$').key(input) or .at(input) — including type-safe code where the JSON column is shaped like Record<string, T> so K extends string is the inferred type — every dot becomes a path-leg separator, letting an attacker traverse from the intended key into sibling and child fields the developer never meant to expose. The result is read access (and, in update statements, write access) to JSON sub-fields outside the intended scope across MySQL, PostgreSQL ->$/->>$, and SQLite. This vulnerability is fixed in 0.28.17.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/kysely-org/kysely/security/advisories/GHSA-pv5w-4p9q-p3v2
- https://github.com/kysely-org/kysely/security/advisories/GHSA-pv5w-4p9q-p3v2
FAQ
What is CVE-2026-44635?
CVE-2026-44635 is a vulnerability with a CVSS score of 7.5 (HIGH). Kysely is a type-safe TypeScript SQL query builder. From 0.26.0 to 0.28.16, DefaultQueryCompiler.visitJSONPathLeg does not escape JSON-path metacharacters (., [, ], *, **, ?). When attacker-controlled...
How severe is CVE-2026-44635?
CVE-2026-44635 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-44635?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.