CVE-2026-53720

pymonocypher uses cython to wrap the Monocypher C library. Prior to version 4.0.2.8, the argon2i32 implementation does not check the nbblocks size. If the caller does not provide a sufficiently large buffer based on the API contract, then argon2i32 will write past the end of the buffer and possib...

CVE-2026-53720 pymonocypher: Potential heap buffer overflow on nb_blocks in argon2i_32 when provided buffer is too small

pymonocypher uses cython to wrap the Monocypher C library. Prior to version 4.0.2.8, the argon2i32 implementation does not check the nbblocks size. If the caller does not provide a sufficiently large buffer based on the API contract, then argon2i32 will write past the end of the buffer and possib...

CVE-2026-53720

pymonocypher (Python bindings to the Monocypher C library) is vulnerable to a heap buffer overflow in the argon2i_32 function prior to version 4.0.2.8 . The root cause is a missing validation of the nb_blocks buffer size: if the caller supplies a buffer smaller than required by the API contract, ...

GHSA-8F95-V3JQ-CJ86 pymonocypher: Potential heap buffer overflow on nb_blocks in argon2i_32 when provided buffer is too small

Impact The argon2i32 implementation does not check the nbblocks size. If the caller does not provide a sufficiently large buffer based on the API contract, then argon2i32 will write past the end of the buffer and possibly corrupt the heap. Patches Fixed in 4.0.2.8, which now verifies that nbblock...

Improper Validation of Specified Quantity in Input

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 argon2i32 function when the provided buffer for nbblocks is too small. An attacker can cause memory corruption ...

PT-2026-56852

Name of the Vulnerable Software and Affected Versions pymonocypher versions prior to 4.0.2.8 Description The argon2i 32 function fails to verify the size of the nb blocks buffer. If the provided buffer is smaller than required by the API contract, the function may write beyond the buffer...