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9.8Critical

Cryptography.Io Cryptography

CVE-2026-39892

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.

What this means for your business

  • It affects Cryptography.Io Cryptography. It matters if your company, or a supplier that handles your data, runs it.
  • An attacker can use it remotely, over a network, without a login, and without anyone at your company clicking anything.
  • FIRST's prediction model gives it a 0.7% chance of attack attempts being seen in the next 30 days, ranking above 49% of all known flaws.

What to do

  1. 1Check whether your company or your suppliers run Cryptography.Io Cryptography, and which version. The affected versions are listed further down this page.
  2. 2If you do, apply the vendor's fix. A patch or vendor advisory has been published.

Not sure if your company is exposed?

Fastnexa’s certified penetration testers can check whether attackers could use this flaw, or others like it, against your websites, apps and network. The full test is free for our first 10 founding clients until 31 December 2026.

Check if you’re exposedBook a call

Scoring

CVSS
9.8 (v3.1)
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4
6.9
Weakness
CWE-119
Assigned by
security-advisories@github.com

Dates

Published
2026-04-08
Last modified
2026-09-10
Sources
NVD

Affected products

  • Cryptography.Io Cryptography45.0.0 - 46.0.7

As listed in the NVD configuration data. Not a statement about your estate.

References