High severity7.5NVD Advisory· Published Mar 27, 2017· Updated Jun 17, 2026
CVE-2016-9243
CVE-2016-9243
Description
HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
cryptographyPyPI | < 1.5.3 | 1.5.3 |
Affected products
7cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*+ 1 more
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.10:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:fedoraproject:fedora:23:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:24:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:25:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
19- www.openwall.com/lists/oss-security/2016/11/09/2nvdMailing ListPatchVDB EntryWEB
- github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874nvdPatchThird Party AdvisoryWEB
- www.securityfocus.com/bid/94216nvdBroken LinkThird Party AdvisoryVDB EntryWEB
- www.ubuntu.com/usn/USN-3138-1nvdThird Party AdvisoryWEB
- cryptography.io/en/latest/changelognvdRelease NotesThird Party AdvisoryWEB
- github.com/advisories/GHSA-q3cj-2r34-2cwcghsaADVISORY
- github.com/pyca/cryptography/issues/3211nvdIssue TrackingThird Party AdvisoryWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/nvdMailing ListThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/nvdMailing ListThird Party Advisory
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/nvdMailing ListThird Party Advisory
- nvd.nist.gov/vuln/detail/CVE-2016-9243ghsaADVISORY
- cryptography.io/en/latest/changelog/ghsaWEB
- github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2017-8.yamlghsaWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXLghsaWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZghsaWEB
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKTghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXLghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZghsaWEB
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKTghsaWEB
News mentions
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