What’s Vulnerable › Vulnerabilities
CVE-2026-33442: Kysely has a MySQL SQL Injection via Backslash Escape Bypass in non-type-safe usage of JSON path keys.
- Severity: high (CVSS 8.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-03-26 · updated 2026-06-17
- Weakness: CWE-89
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.
Affected products
- kysely-org kysely: from 0.28.12 before 0.28.14 — fixed in 0.28.14
How to fix
Upgrade to a fixed version: kysely-org kysely 0.28.14. Check the vendor advisory for mitigations.
References
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