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CVE-2026-39892

Cryptography.io Cryptography buffer overflow

9.8 CRITICALEPSS 0.76%
  1. Published8 Apr 2026

Description

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. From 45.0.0 to before 46.0.7, if a non-contiguous buffer was passed to APIs which accepted Python buffers (e.g. Hash.update()), this could lead to buffer overflows. This vulnerability is fixed in 46.0.7.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Cryptography.io Cryptography≥ 45.0.0 < 46.0.7

Remediation

Fixed in
Cryptography.io Cryptography≥ 46.0.7

References

and 20 more references

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Frequently asked

Is CVE-2026-39892 being actively exploited?

CVE-2026-39892 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.76%.

How severe is CVE-2026-39892?

CVE-2026-39892 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.76% probability of exploitation.

Which products are affected by CVE-2026-39892?

Affected products include Cryptography.io Cryptography.

How do I fix CVE-2026-39892?

Upgrade affected software to a fixed version, for example Cryptography.io Cryptography 46.0.7 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-39892 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.