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CVE-2019-3558 Python Facebook Thrift servers would not error upon receiving messages with containers of fields of unknown type

Description

Python Facebook Thrift servers would not error upon receiving messages with containers of fields of unknown type. As a result, malicious clients could send short messages which would take a long time for the server to parse, potentially leading to denial of service. This issue affects Facebook Thrift prior to v2019.02.18.00.

Affected products and versions

Product Affected versions Fixed in
Facebook Thrift 2019.02 earliest → 2019.02.18.00 2019.02.18.00
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