CVE-2026-44635: high-severity vulnerability in kysely-org kysely
Kysely: JSON-path traversal injection via unsanitized path-leg metacharacters in `JSONPathBuilder.key()` / `.at()`
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.4%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products
kysely-org · kyselyRelated CVEs — kysely-org kysely
In the same product, most dangerous first.
CVE-2026-33442HIGHKysely has a MySQL SQL Injection via Backslash Escape Bypass in non-type-safe usage of JSON path keys.EPSS 0.4%CVE-2026-32763HIGHSQL Injection via unsanitized JSON path keys when ignoring/silencing compilation errors or using `Kysely<any>`.EPSS 0.4%CVE-2026-33468HIGHKysely has a MySQL SQL Injection via Insufficient Backslash Escaping in `sql.lit(string)` usage or similar methods that append string literal values into the compiled SQL stringsEPSS 0.4%