CVE-2016-9243

python-cryptography: HKDF might return an empty byte-string

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Severity

Low

Red Hat Product Security

4.8

CVSS 3.0

Review impact separately from score.

Published · November 5, 2016

Updated · November 22, 2025

Description

HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 4.8
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS 2.0 · 4
AV:N/AC:H/Au:N/C:P/I:P/A:N

CWE-327 · Use of a Broken or Risky Cryptographic Algorithm