Jsish

Jsish is a scripting engine and interpreter that, despite a narrow product scope, has achieved prominence in the vulnerability landscape through a concentrated disclosure history. Vulnerabilities affecting the product skew strongly toward critical-severity outcomes and center on memory-safety issues including use-after-free conditions, out-of-bounds writes, NULL-pointer dereferences, and reachable assertions—flaws characteristic of an interpreter implemented in native code where parsing and evaluation state management are complex. The recurring nature of these weakness classes suggests systematic exposure in the engine's core memory-handling paths rather than isolated issues, making each disclosure relevant to any deployment relying on the interpreter. Defenders should treat updates to this product as security-critical and evaluate whether the interpreter is embedded in wider systems where memory-safety vulnerabilities carry outsized risk; live exploitation activity, KEV status, and current exposure counts are shown alongside this summary.