CVE-2026-33442

Kysely has a MySQL SQL Injection via Backslash Escape Bypass in non-type-safe usage of JSON path keys.

State: Published
Severity: 8.1 High
Published: Mar 26, 2026
Updated: Mar 26, 2026
Reserved: Mar 19, 2026

Description

Kysely is a type-safe TypeScript SQL query builder. In versions 0.28.12 and 0.28.13, the `sanitizeStringLiteral` method in Kysely's query compiler escapes single quotes (`'` → `''`) but does not escape backslashes. On MySQL with the default `BACKSLASH_ESCAPES` SQL mode, an attacker can inject a backslash before a single quote to neutralize the escaping, breaking out of the JSON path string literal and injecting arbitrary SQL. Version 0.28.14 fixes the issue.

Scores

CVSS	Score	Vector	Source
3.1	8.1 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-89 Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

Affected Products

Product	Versions
kyselykysely-org	>= 0.28.12, < 0.28.14Affected

References

https://github.com/kysely-org/kysely/security/advisories/GHSA-fr9j-6mvq-frcv

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