CVE-2026-27459 - Vulnerability Details

pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.

Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

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 0.00704.

Exploitation none

Automatable no

Technical Impact total

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

pyopenssl

affected

Version	Status	Constraints
`>= 22.0.0, < 26.0.0`	affected	—

Configuration 1 [-]

cpe:2.3:a:pyopenssl:pyopenssl:*:*:*:*:*:*:*:*

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors	Products
Pyca Subscribe	Pyopenssl Subscribe

Project Subscriptions

Vendors	Products
Pyca Subscribe	Pyopenssl Subscribe
Pyopenssl Subscribe	Pyopenssl Subscribe

Advisories

Source	ID	Title
Github GHSA	GHSA-5pwr-322w-8jr4	pyOpenSSL DTLS cookie callback buffer overflow
Ubuntu USN	USN-8115-1	pyOpenSSL vulnerabilities

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://access.redhat.com/errata/RHSA-2026:10754
https://access.redhat.com/errata/RHSA-2026:11856
https://access.redhat.com/errata/RHSA-2026:11916
https://access.redhat.com/errata/RHSA-2026:11996
https://access.redhat.com/errata/RHSA-2026:13508
https://access.redhat.com/errata/RHSA-2026:13512
https://access.redhat.com/errata/RHSA-2026:13545
https://access.redhat.com/errata/RHSA-2026:13553
https://access.redhat.com/errata/RHSA-2026:14835
https://access.redhat.com/errata/RHSA-2026:14873
https://access.redhat.com/errata/RHSA-2026:14874
https://access.redhat.com/errata/RHSA-2026:19375
https://access.redhat.com/errata/RHSA-2026:21017
https://access.redhat.com/errata/RHSA-2026:22465
https://access.redhat.com/errata/RHSA-2026:24853
https://access.redhat.com/errata/RHSA-2026:48085
https://access.redhat.com/errata/RHSA-2026:48758
https://access.redhat.com/errata/RHSA-2026:59153
https://access.redhat.com/errata/RHSA-2026:7224
https://access.redhat.com/errata/RHSA-2026:8437
https://access.redhat.com/security/cve/CVE-2026-27459
https://bugzilla.redhat.com/show_bug.cgi?id=2448503
https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst
https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408
https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4
https://nvd.nist.gov/vuln/detail/CVE-2026-27459
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27459.json
https://www.cve.org/CVERecord?id=CVE-2026-27459

History

Tue, 25 Aug 2026 13:30:00 +0000

Type	Values Removed	Values Added
References		https://access.redhat.com/errata/RHSA-2026:59153

Mon, 17 Aug 2026 12:30:00 +0000

Type	Values Removed	Values Added
References		https://access.redhat.com/errata/RHSA-2026:48758

Mon, 23 Mar 2026 18:15:00 +0000

Type	Values Removed	Values Added
First Time appeared		Pyopenssl Pyopenssl pyopenssl
CPEs		cpe:2.3:a:pyopenssl:pyopenssl::::::::
Vendors & Products		Pyopenssl Pyopenssl pyopenssl
Metrics	cvssV3_1 `{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}`	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'}`

Thu, 19 Mar 2026 00:15:00 +0000

Type	Values Removed	Values Added
References		https://nvd.nist.gov/vuln/detail/CVE-2026-27459 https://www.cve.org/CVERecord?id=CVE-2026-27459
Metrics	threat_severity `None`	cvssV3_1 `{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'}` threat_severity `Important`

Wed, 18 Mar 2026 20:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Wed, 18 Mar 2026 12:15:00 +0000

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

Tue, 17 Mar 2026 23:45:00 +0000

Type	Values Removed	Values Added
Description		pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.
Title		pyOpenSSL DTLS cookie callback buffer overflow
Weaknesses		CWE-120
References		https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408 https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4
Metrics		cvssV4_0 `{'score': 7.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U'}`

Projects

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MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-03-17T23:34:28.483Z

Updated: 2026-08-31T12:04:21.760Z

Reserved: 2026-02-19T17:25:31.100Z

Link: CVE-2026-27459

Vulnrichment

Updated: 2026-08-31T12:04:21.760Z

NVD

Status : Modified

Published: 2026-03-18T00:16:19.273

Modified: 2026-08-31T13:17:33.347

Link: CVE-2026-27459

Redhat

Severity : Important

Publid Date: 2026-03-17T23:34:28Z

Links: CVE-2026-27459 - Bugzilla

OpenCVE Enrichment

Updated: 2026-03-24T10:54:19Z

Weaknesses

CWE-120

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Attack Vector Network

Attack Complexity High

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact High

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

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 no

Technical Impact total

Project Subscriptions

Projects

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