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| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
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| @lambda-middleware/json-deserializer | npm | < 1.1.0 | 1.1.0 |
The vulnerability stems from the regex-based MIME type validation in isJsonMimeType. The original regex pattern contained (.++) which creates ambiguity in pattern matching and allows for exponential backtracking on malformed inputs. This was explicitly replaced in the patch (f689404) with a safer string parsing approach, confirming this was the vulnerable component. The CWE-1333 classification and commit message both directly reference regex inefficiency as the issue.
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