CVE-2026-42345: Broken Json String Escaping Lookbehind Replace
Insecure manual JSON string escaping: using .replace(/(?<!\\)"/g, '\\"') to sanitize user-controlled values for JSON string interpolation is bypassable. The negative lookbehind treats a user-supplied backslash before a double-quote as an escape prefix, so that quote is left unescaped in the output. Because the backslash itself is never encoded to '\\', the J
JSgreprules fetch cve-2026-42345-broken-json-string-escaping-lookbehind-replace --engine opengrepDescription
Insecure manual JSON string escaping: using .replace(/(?<!\\)"/g, '\\"') to sanitize user-controlled values for JSON string interpolation is bypassable. The negative lookbehind treats a user-supplied backslash before a double-quote as an escape prefix, so that quote is left unescaped in the output. Because the backslash itself is never encoded to '\\', the J
Community feedback
0 rule-level signals from signed-in users.
- Useful reports
- 0
- Context false positives
- 0
- Metadata suggestions
- 0
Contextual precision
Aggregated from approved scan feedback. False-positive reports describe observed scan contexts, not a global rule verdict.
- Findings observed
- 0
- Projects
- 0
- Reporters
- 0
Precision details are collecting more signed-in reports before verdict counts or ratios are emphasized.
No approved finding verdicts yet.
No scan diagnostics reported yet.