What is CVE-2018-15560?

CVE-2018-15560 is a high-severity vulnerability in Pycryptodome, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2018-08-20.

How severe is CVE-2018-15560?

High severity. CVSS v3 base score is 7.5 out of 10.

Integer overflow in Pycryptodome

CVE-2018-15560

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.

Vulnerability class: Integer Overflow

Published 2018-08-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.1th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Pycryptodome

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

References

whitehatck01.blogspot.com/2018/08/integer-overflow-vulnerability-in.html (Exploit, Third Party Advisory)
github.com/Legrandin/pycryptodome/issues/198 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-15560?: CVE-2018-15560 is a high-severity vulnerability in Pycryptodome, classified under Integer Overflow or Wraparound. CVSS score: 7.5/10. Published 2018-08-20.
How severe is CVE-2018-15560?: High severity. CVSS v3 base score is 7.5 out of 10.