CVE-2018-15560: Pycryptodome

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

PyCryptodome before 3.6.6 has an integer overflow in the data_len variable in AESNI.c, related to the AESNI_encrypt and AESNI_decrypt functions, leading to the mishandling of messages shorter than 16 bytes.

Affected products

• Pycryptodome Pycryptodome: before 3.6.6 (fixed in 3.6.6)

Published 2018-08-20. Last modified 2026-06-17.