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CVE-2026-54658 is a SQL injection vulnerability in Hypequery's ClickHouse package affecting versions prior to 2.0.2. The flaw is in the escapeValue() function in packages/clickhouse/src/core/utils.ts during parameter substitution for string values. The implementation escaped single quotes by doubling them but did not escape literal backslashes first. Because ClickHouse interprets backslash-quote sequences as escaped quotes, an attacker-controlled parameter ending with a backslash can cause the intended closing quote to be treated as part of the string literal rather than as a delimiter. This leaves the string context open and allows subsequent attacker-controlled content to be parsed as SQL. The issue stems from an escaping mismatch between SQL-92 assumptions and ClickHouse string parsing behavior. Version 2.0.2 fixes the vulnerability by escaping backslashes before escaping single quotes.
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A SQL injection vulnerability in Hypequery's ClickHouse package caused by improper escaping of backslashes before single quotes in escapeValue(), allowing attacker-controlled parameters to inject arbitrary SQL queries.
A SQL injection vulnerability in @hypequery/clickhouse caused by improper escaping of backslashes in string values, allowing crafted input to break query structure and inject active SQL against ClickHouse.
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