Improper Validation of Specified Quantity in Input Affecting pymonocypher package, versions [,4.0.2.7)
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Test your applications- Snyk IDSNYK-PYTHON-PYMONOCYPHER-17911752
- published9 Jul 2026
- disclosed9 Jul 2026
- creditUnknown
Introduced: 9 Jul 2026
CVE-2026-53720 (opens in a new tab)Common Vulnerabilities and Exposures (CVE) are common identifiers for publicly known security vulnerabilities
Common Weakness Enumeration (CWE) is a category system for software weaknesses
Common Weakness Enumeration (CWE) is a category system for software weaknesses
Common Weakness Enumeration (CWE) is a category system for software weaknesses
How to fix?
Upgrade pymonocypher to version 4.0.2.7 or higher.
Overview
pymonocypher is a Python ctypes bindings to the Monocypher library
Affected versions of this package are vulnerable to Improper Validation of Specified Quantity in Input in the argon2i_32 function when the provided buffer for nb_blocks is too small. An attacker can cause memory corruption or potentially execute arbitrary code by supplying an undersized buffer to the function.
Workaround
This vulnerability can be mitigated by providing a correctly sized nb_blocks buffer.