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 argon2i_32 implementation does not check the nb_blocks size. If the caller does not prov…
Published: 2026-09-03 · CVSS: 5.1 · CVSS 4.0
pymonocypher uses cython to wrap the Monocypher C library. Prior to version 4.0.2.8, the argon2i_32 implementation does not check the nb_blocks size. If the caller does not provide a sufficiently large buffer based on the API contract, then argon2i_32 will write past the end of the buffer and possibly corrupt the heap. This issue has been patched in version 4.0.2.8.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7