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CVE-2026-56018 is a denial-of-service vulnerability in JavaScript::Minifier::XS for Perl affecting versions before 0.16. The flaw is in the XS implementation of minify(), specifically in JsMinify (XS.xs). Cleanup logic frees only NodeSet structures but does not free the per-token contents buffers allocated in JsSetNodeContents, and JsDiscardNode unlinks nodes without freeing their contents. In addition, two early-return paths taken when the node list is empty leak the entire NodeSet. As a result, each call to minify() leaks memory, causing unbounded memory growth in long-lived processes that repeatedly minify JavaScript.
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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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