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MEDIUM

CVE-2023-23931

CVSS v3

6.5

MEDIUM

EPSS Score

1.3 %

exploit probability, as of 2026-10-17

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • cryptographyPyPIfrom 1.8 · fixed in 39.0.1
  • python3-cryptographyAlmaLinux:9all versions · fixed in 36.0.1-4.el9
  • python3-cryptographyAlmaLinux:8all versions · fixed in 3.2.1-6.el8
  • python39AlmaLinux:8all versions · fixed in 3.9.18-3.module_el8.10.0+3765+2f9a457dand 7 other packages
  • python39-attrsAlmaLinux:8all versions · fixed in 20.3.0-2.module_el8.6.0+2780+a40f65e1
  • python39-cffiAlmaLinux:8all versions · fixed in 1.14.3-2.module_el8.6.0+3248+c431e88c
  • python39-chardetAlmaLinux:8all versions · fixed in 3.0.4-19.module_el8.6.0+2780+a40f65e1
  • python39-cryptographyAlmaLinux:8all versions · fixed in 3.3.1-3.module_el8.10.0+3765+2f9a457d

31 more package ranges on OSV.dev

Vendor advisories

  • CVE-2023-23931 Red Hat Product Security302 products fixed · 10 known affected

    python-cryptography: memory corruption via immutable objects

    discovery-server-container as a component of Red Hat Discovery 1 · python-cryptography.src as a component of Red Hat Enterprise Linux 7 · python2-cryptography as a component of Red Hat Enterprise Linux 7

  • RHSA-2024:2985 Red Hat Product Security229 products fixed

    Red Hat Security Advisory: python39:3.9 and python39-devel:3.9 security update

  • ICSA-24-046-11 CISA11 known affected

    Siemens SCALANCE XCM-/XRM-300

    SCALANCE XCH328 (6GK5328-4TS01-2EC2) · SCALANCE XCM324 (6GK5324-8TS01-2AC2) · SCALANCE XCM328 (6GK5328-4TS01-2AC2)

  • SSA-806742 Siemens ProductCERT11 known affected

    SSA-806742: Multiple Vulnerabilities in SCALANCE XCM-/XRM-300 before V2.4

    SCALANCE XCH328 (6GK5328-4TS01-2EC2) · SCALANCE XCM324 (6GK5324-8TS01-2AC2) · SCALANCE XCM328 (6GK5328-4TS01-2AC2)

  • RHSA-2023:7341 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat Quay security update

  • RHSA-2023:7096 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: python-cryptography security update

4 more advisories

Full record on NVD

Description

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.

Technical details

Published
2023-02-07

Frequently asked questions

What is CVE-2023-23931?

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In affected versions `Cipher.update_into` would accept Python objects which implement the buffer protocol, but provide only immutable buffers. This would allow immutable objects (such as `bytes`) to be mutated, thus violating fundamental rules of Python and resulting in corrupted output. This now correctly raises an exception. This issue has been present since `update_into` was originally introduced in cryptography 1.8.

Is CVE-2023-23931 actively exploited?

Active exploitation of CVE-2023-23931 has not been confirmed. Its EPSS score was 1.3% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-23931?

CVE-2023-23931 has a CVSS v3 base score of 6.5 (MEDIUM severity).

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