fix: reject spoofed RegExp objects with non-string source property#222
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A fake RegExp created via Object.create(RegExp.prototype) passes instanceof RegExp but can supply an object as .source. That object survives serialize() as executable JS and runs when the consumer evaluates new RegExp(obj, flags) via toString() coercion. Guard mirrors the existing URL fix: assert typeof source === 'string' and throw TypeError otherwise. Fixes PSECBUGS-112938 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Fixes PSECBUGS-108887 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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@okuryu Please merge and release a new patch version when ready. |
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Sure, I'll try to check on today! |
okuryu
approved these changes
Jun 30, 2026
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released v7.0.7. |
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A fake RegExp created via Object.create(RegExp.prototype) passes instanceof RegExp but can supply an object as .source. That object survives serialize() as executable JS and runs when the consumer evaluates new RegExp(obj, flags) via toString() coercion. Guard mirrors the existing URL fix: assert typeof source === 'string' and throw TypeError otherwise.
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