libexpat library is vulnerable to DoS attacks through stack overflow

ronjor · May 12, 2025

Original Release Date: 2025-05-09 | Last Revised: 2025-05-09

Description
A stack overflow vulnerability exists in the libexpat library due to the way it handles recursive entity expansion in XML documents. When parsing an XML document with deeply nested entity references, libexpat can be forced to recurse indefinitely, exhausting the stack space and causing a crash.
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This issue could lead to denial of service (DoS) or, in some cases, exploitable memory corruption, depending on the environment and library usage.
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Solution
A patch for the vulnerability has been provided in version 2.7.0 of libexpat. Groups that use libexpat can verify their patch using the POCs provided here: https://github.com/libexpat/libexpat/issues/893#payload_generators
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libexpat library is vulnerable to DoS attacks through stack overflow

ronjor Global Moderator

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libexpat library is vulnerable to DoS attacks through stack overflow

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