CVE-2026-39892 - Vulnerability Details

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.

Published: 2026-04-08

Score: 6.9 Medium

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

pyca

cryptography

affected

Version	Status	Constraints
`>= 45.0.0, < 46.0.7`	affected	—

Configuration 1 [-]

cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:python:*:*

No data.

Vendor Product Confidence Versions

Pyca

Cryptography

100%

Version	Status	Scheme	Platform
`[45.0.0,46.0.7)`	affected	semver	—

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

Source	ID	Title
Github GHSA	GHSA-p423-j2cm-9vmq	Cryptography vulnerable to buffer overflow if non-contiguous buffers were passed to APIs

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00652.

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
http://www.openwall.com/lists/oss-security/2026/04/08/12
https://access.redhat.com/errata/RHSA-2026:19375
https://access.redhat.com/errata/RHSA-2026:20338
https://access.redhat.com/errata/RHSA-2026:21017
https://access.redhat.com/errata/RHSA-2026:22465
https://access.redhat.com/errata/RHSA-2026:22629
https://access.redhat.com/errata/RHSA-2026:22840
https://access.redhat.com/errata/RHSA-2026:23361
https://access.redhat.com/errata/RHSA-2026:24483
https://access.redhat.com/errata/RHSA-2026:24761
https://access.redhat.com/errata/RHSA-2026:24762
https://access.redhat.com/errata/RHSA-2026:24853
https://access.redhat.com/errata/RHSA-2026:24866
https://access.redhat.com/errata/RHSA-2026:24977
https://access.redhat.com/errata/RHSA-2026:30088
https://access.redhat.com/errata/RHSA-2026:30089
https://access.redhat.com/errata/RHSA-2026:37275
https://access.redhat.com/errata/RHSA-2026:42644
https://access.redhat.com/errata/RHSA-2026:43651
https://access.redhat.com/errata/RHSA-2026:43670
https://access.redhat.com/errata/RHSA-2026:43851
https://access.redhat.com/errata/RHSA-2026:43853
https://access.redhat.com/errata/RHSA-2026:43854
https://access.redhat.com/errata/RHSA-2026:43855
https://access.redhat.com/errata/RHSA-2026:46956
https://access.redhat.com/errata/RHSA-2026:7295
https://access.redhat.com/security/cve/CVE-2026-39892
https://bugzilla.redhat.com/show_bug.cgi?id=2456735
https://github.com/pyca/cryptography/commit/622d672e429a7cff836a23c5903683dbec1901f5
https://github.com/pyca/cryptography/security/advisories/GHSA-p423-j2cm-9vmq
https://nvd.nist.gov/vuln/detail/CVE-2026-39892
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39892.json
https://www.cve.org/CVERecord?id=CVE-2026-39892

History

Wed, 15 Apr 2026 16:15:00 +0000

Type	Values Removed	Values Added
First Time appeared		Cryptography.io Cryptography.io cryptography
CPEs		cpe:2.3:a:cryptography.io:cryptography::::::python::*
Vendors & Products		Cryptography.io Cryptography.io cryptography
Metrics	cvssV3_1 `{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}`	cvssV3_1 `{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}`

Fri, 10 Apr 2026 04:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Fri, 10 Apr 2026 00:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-131
References		https://github.com/pyca/cryptography/commit/622d672e429a7cff836a23c5903683dbec1901f5 https://nvd.nist.gov/vuln/detail/CVE-2026-39892 https://www.cve.org/CVERecord?id=CVE-2026-39892
Metrics	threat_severity `None`	cvssV3_1 `{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}` threat_severity `Moderate`

Thu, 09 Apr 2026 08:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Pyca Pyca cryptography
Vendors & Products		Pyca Pyca cryptography

Wed, 08 Apr 2026 22:30:00 +0000

Type	Values Removed	Values Added
References		http://www.openwall.com/lists/oss-security/2026/04/08/12

Wed, 08 Apr 2026 21:15:00 +0000

Type	Values Removed	Values Added
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.
Title		cryptography has a buffer overflow if non-contiguous buffers were passed to APIs
Weaknesses		CWE-119
References		https://github.com/pyca/cryptography/security/advisories/GHSA-p423-j2cm-9vmq
Metrics		cvssV4_0 `{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}`

Subscriptions

Cryptography.io Cryptography

Pyca Cryptography

MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-04-08T20:49:41.967Z

Updated: 2026-08-10T12:05:49.107Z

Reserved: 2026-04-07T20:32:03.011Z

Link: CVE-2026-39892

Vulnrichment

Updated: 2026-04-08T21:16:07.164Z

NVD

Status : Modified

Published: 2026-04-08T21:17:01.547

Modified: 2026-07-30T12:18:29.637

Link: CVE-2026-39892

Redhat

Severity : Moderate

Publid Date: 2026-04-08T20:49:41Z

Links: CVE-2026-39892 - Bugzilla

OpenCVE Enrichment

Updated: 2026-04-10T09:40:32Z

Weaknesses

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{"bugzilla": {"description": "cryptography: Cryptography: Buffer overflow via non-contiguous buffer in API", "id": "2456735", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2456735"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-131", "details": ["A flaw was found in the cryptography library. This vulnerability occurs when a non-contiguous buffer is passed to certain application programming interfaces (APIs) that accept Python buffers, such as Hash.update(). A remote attacker could exploit this to cause a buffer overflow, potentially leading to a denial of service."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-39892", "package_state": [{"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Fix deferred", "package_name": "redhat-user-workloads/lightspeed-stack", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:lightspeed_core", "fix_state": "Fix deferred", "package_name": "redhat-user-workloads/rag-tool", "product_name": "Lightspeed Core"}, {"cpe": "cpe:/a:redhat:migration_toolkit_applications:8", "fix_state": "Fix deferred", "package_name": "redhat-user-workloads/art-images", "product_name": "Migration Toolkit for Applications 8"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", 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"cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "redhat-user-workloads/iop-advisor-engine", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "redhat-user-workloads/iop-host-inventory-sat-6-18", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "redhat-user-workloads/iop-vmaas-sat-6-18", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:trusted_artifact_signer:1", "fix_state": "Fix deferred", "package_name": "securesign/model-transparency", "product_name": "Red Hat Trusted Artifact Signer"}], "public_date": "2026-04-08T20:49:41Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-39892\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-39892\nhttp://www.openwall.com/lists/oss-security/2026/04/08/12\nhttps://github.com/pyca/cryptography/commit/622d672e429a7cff836a23c5903683dbec1901f5\nhttps://github.com/pyca/cryptography/security/advisories/GHSA-p423-j2cm-9vmq"], "threat_severity": "Moderate"}

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

Exploitation none

Automatable yes

Technical Impact partial

Subscriptions

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