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CVE-2017-16137 is a regular expression denial of service vulnerability in the npm package debug. The issue occurs when untrusted user-controlled input is passed into the package's o formatter, which can trigger excessive backtracking or otherwise expensive regular expression evaluation. As a result, specially crafted large input can consume significant CPU time in the Node.js process and stall normal processing. The provided advisory notes that roughly 50,000 characters are sufficient to block execution for about 2 seconds, indicating a relatively low-severity but practical event-loop blocking condition.
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debug package's o formatter. Where immediate upgrade is not possible, reduce exposure by validating, truncating, or rejecting excessively large input before it reaches the vulnerable formatting path. Because exploitation relies on large crafted strings, input size limits and rate limiting may reduce practical impact, but upgrading to a fixed version is the appropriate mitigation.Patch, then assume compromise.
debug to a fixed release. The advisory identifies the following patched versions: 2.6.9 or later for the 2.x branch, 3.1.0 or later for 3.0.x, 3.2.7 or later for 3.2.x, or 4.3.1 or later for 4.x.No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
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