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PYSEC-2026-2269

🗓️ 18 Mar 2026 00:16:19Reported by Python Packaging AdvisoryType 
pypa
 pypa🔗 github.com👁 3 Views

pyOpenSSL could overflow a buffer when cookie callback returned over 256 bytes; oversized cookies are rejected from version 26.0.0.

Related
Detection
Refs
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: DataStage on Cloud Pak for Data has several vulnerabilities due to open source software
22 Jun 202614:27
–ibm
IBM Security Bulletins		Security Bulletin: IBM Cloud Pak for Data System (CPDS 1.0) is affected by multiple vulnerabilities due to pyOpenSSL
10 Jul 202606:14
–ibm
IBM Security Bulletins		Security Bulletin: IBM Watson Speech Services Cartridge is vulnerable to a security bypass in pyOpenSSL [CVE-2026-27448, CVE-2026-27459]
21 May 202615:10
–ibm
IBM Security Bulletins		Security Bulletin: pyOpenSSL TLS SNI Callback Exception Handling Flaw Allows Security Bypass
4 May 202612:18
–ibm
IBM Security Bulletins		Security Bulletin: Multiple Vulnerabilities in pyOpenSSL bundled with IBM Fusion, IBM Fusion HCI, and IBM Fusion Data Cataloging
18 May 202622:19
–ibm
IBM Security Bulletins		Security Bulletin: IBM SOAR QRadar Plugin App is vulnerable to using components with known vulnerabilities
6 May 202616:21
–ibm
IBM Security Bulletins		Security Bulletin: Vulnerabilities in cryptography, pyOpenSSL & golang affect IBM Storage Protect Plus
26 Jun 202606:08
–ibm
ATTACKERKB		CVE-2026-27459
17 Mar 202623:34
–attackerkb
AlpineLinux		CVE-2026-27459
17 Mar 202623:34
–alpinelinux
AstraLinux		Astra Linux – Vulnerability in pyopenssl
24 Jun 202615:11
–astralinux
Rows per page
Vulners
Node
pypipyopensslRange22.0.0–26.0.0

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13 Jul 2026 05:51Current
6.4Medium risk
Vulners AI Score6.4
CVSS 3.18.1 - 9.8
CVSS 49.2
EPSS0.00704
SSVC
pyopensslbuffer overflowcookie callbackoversized cookiesOpenSSL integrationversion twenty six
3