PyCryptodome before 3.6.6 has an integer overflow in the data_len variable in AESNI.c…
Priority LOW 36CWE-190Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-190 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.01756 78th percentileScored 2026-11-07
Public exploit Yes 2 exploit referencesTagged by NVD
Fix Fixed pycryptodome (PyPI): 3.6.6
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | pycryptodome (PyPI) | before 3.6.6 | 3.6.6 | Patch available | GHSA-hgg3-g7gr-66r7 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- pycryptodome (PyPI) Vendor— Affected before 3.6.6 Fixed in 3.6.6 Patch available GHSA-hgg3-g7gr-66r7
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:pycryptodome:pycryptodome:*:*:*:*:*:*:*:* | before 3.6.6 | Vulnerable | Pycryptodome |
- cpe:2.3:a:pycryptodome:pycryptodome:*:*:*:*:*:*:*:* Versions before 3.6.6 Vulnerable ·Pycryptodome
Remediation
- Fix · GHSA-hgg3-g7gr-66r7 pycryptodome (PyPI) Fixed in 3.6.6 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2018-15560
- 2026-10-03 Alias added: GHSA-hgg3-g7gr-66r7
References
Exploit 2
Advisory 2
More Pycryptodome vulnerabilities
- TI-2023-28707 PyCryptodome and pycryptodomex before 3.19.1 allow side-channel leakage for OAEP… CVSS 3.1MEDIUM 5.9
Sources
- CVE-2018-15560 · CVE Program
- CVE-2018-15560 · NVD
- FIRST EPSS
- GHSA-hgg3-g7gr-66r7 · GitHub Advisory Database · CC BY 4.0
- CVE-2018-15560 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences