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pyOpenSSL: DTLS cookie callback buffer overflow

🗓️ 04 May 2026 14:10:09Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 18 Views

Flaw in pyOpenSSL DTLS cookie callback causes overflow when cookie exceeds 256 bytes due to missing bounds check.

Related
Packages
Refs
ReporterTitlePublishedViews
Family
IBM Security Bulletins		Security Bulletin: Vulnerability pyopenssl, jackson-core, pyasn, log4j-core, handlebars, twisted, bcpkix-jdk18on, Mako, httpd, apache2-build, wheel, click, moment-timezone-with-data, urllib, pip July 2026
27 Jul 202616:25
–ibm
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
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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9aarch64automation-controller4.7.11-2.el9.apautomation-controller-4.7.11-2.el9.ap.aarch64.rpm
Red Hat Enterprise Linux9ppc64leautomation-controller4.7.11-2.el9.apautomation-controller-4.7.11-2.el9.ap.ppc64le.rpm
Red Hat Enterprise Linux9s390xautomation-controller4.7.11-2.el9.apautomation-controller-4.7.11-2.el9.ap.s390x.rpm
Red Hat Enterprise Linux9x86_64automation-controller4.7.11-2.el9.apautomation-controller-4.7.11-2.el9.ap.x86_64.rpm
Red Hat Enterprise Linux9noarchautomation-controller-cli4.7.11-2.el9.apautomation-controller-cli-4.7.11-2.el9.ap.noarch.rpm
Red Hat Enterprise Linux9noarchautomation-controller-server4.7.11-2.el9.apautomation-controller-server-4.7.11-2.el9.ap.noarch.rpm
Red Hat Enterprise Linux9noarchautomation-controller-ui4.7.11-2.el9.apautomation-controller-ui-4.7.11-2.el9.ap.noarch.rpm
Red Hat Enterprise Linux9aarch64automation-controller-venv-tower4.7.11-2.el9.apautomation-controller-venv-tower-4.7.11-2.el9.ap.aarch64.rpm
Red Hat Enterprise Linux9ppc64leautomation-controller-venv-tower4.7.11-2.el9.apautomation-controller-venv-tower-4.7.11-2.el9.ap.ppc64le.rpm
Red Hat Enterprise Linux9s390xautomation-controller-venv-tower4.7.11-2.el9.apautomation-controller-venv-tower-4.7.11-2.el9.ap.s390x.rpm
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27 Jul 2026 16:19Current
6Medium risk
Vulners AI Score6
CVSS 3.18.1 - 9.8
CVSS 49.2
EPSS0.00704
SSVC
CWE-120
OpenSSLDatagram TLScookie callbackbuffer overflowbounds checkingunix
18