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CVE-2026-27459 is a buffer overflow vulnerability in the pyOpenSSL library's set_cookie_generate_callback function. When a custom callback returns a cookie string or byte sequence longer than 256 bytes, a buffer overflow can occur due to missing bounds checking before copying data into a fixed-size buffer in the underlying OpenSSL library. This vulnerability requires that the application using pyOpenSSL provides such a custom callback and returns an oversized cookie, limiting its exposure. The flaw is associated with CWE-120 (Classic Buffer Overflow) and can lead to memory modification, unauthorized code execution, or denial of service. Red Hat Hardened Images RPMs are affected, and the advisory references multiple CVEs including CVE-2026-27448 and CVE-2026-27459. No explicit patch availability is stated in the vendor advisory, but mitigation guidance is provided.

Detailed information about Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update affecting Red Hat Product Security Red Hat. Ge

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update - Live Threat Intelligence - Threat Radar | OffSeq.com

https://access.redhat.com/errata/RHSA-2026:7224

https://images.redhat.com/

https://access.redhat.com/security/cve/CVE-2026-27459

https://access.redhat.com/security/updates/classification/

https://access.redhat.com/security/cve/CVE-2026-27448

Canonical URL

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

pyopenssl

CVE-2026-27448 is a vulnerability in pyOpenSSL versions from 0.14.0 up to but not including 26.0.0. It involves unhandled exceptions in user-provided callbacks to set_tlsext_servername_callback, which cause the connection to be accepted rather than rejected. This behavior is a failure to fail securely ('failing open'), potentially allowing bypass of security-sensitive logic in these callbacks. The issue was fixed in pyOpenSSL version 26.0.0 by changing the behavior to reject connections on such exceptions.

This vulnerability in pyOpenSSL affects versions from 0.14.0 up to but not including 26.0.0. When user-provided callbacks to set_tlsext_servername_callback raise unhandled exceptions, the connection is incorrectly accepted instead of being rejected. This 'failing open' behavior can allow attackers to bypass security checks implemented in these callbacks. The issue is classified under CWE-636 (Not Failing Securely). The problem was addressed in version 26.0.0 by modifying the code to reject connections when such exceptions occur, thereby enforcing secure failure behavior.

Detailed information about CVE-2026-27448: CWE-636: Not Failing Securely ('Failing Open') in pyca pyopenssl affecting pyca pyopenssl. Get real-time updates, tec

CVE-2026-27448: CWE-636: Not Failing Securely ('Failing Open') in pyca pyopenssl - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-27448: CWE-636: Not Failing Securely ('Failing Open') in pyca pyopenssl


Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement updateCVE-2026-27448 0 This update includes the following RPMs: HighVulnerability#gcve #csaf #cve-2026-27448 Join the discussion	GCVE Database	04/09/2026, 04:58:57 UTC Added: 06/10/2026, 11:56:58 UTC
CVE-2026-27448: CWE-636: Not Failing Securely ('Failing Open') in pyca pyopensslCVE-2026-27448 0 CVE-2026-27448 is a vulnerability in pyOpenSSL versions from 0.14.0 up to but not including 26.0.0. It involves unhandled exceptions in user-provided callbacks to set_tlsext_servername_callback, which cause the connection to be accepted rather than rejected. This behavior is a failure to fail securely ('failing open'), potentially allowing bypass of security-sensitive logic in these callbacks. The issue was fixed in pyOpenSSL version 26.0.0 by changing the behavior to reject connections on such exceptions. LowVulnerabilityUnited StatesGermanyUnited Kingdom+7#cve #cve-2026-27448 #cwe-636 Join the discussion	CVE Database V5	03/17/2026, 23:24:30 UTC Added: 03/17/2026, 23:43:22 UTC

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