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CVE-2026-27448 affects pyOpenSSL versions 0.14.0 through versions before 26.0.0. The Context.set_tlsext_servername_callback implementation silently swallowed unhandled exceptions raised by an application-provided TLS server-name callback and allowed the TLS handshake to proceed as though the callback had succeeded. Applications that used this callback to enforce security-sensitive policy could therefore fail open when the callback raised an exception. pyOpenSSL 26.0.0 changes this behavior to invoke sys.excepthook and terminate the handshake with a fatal TLS alert.
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A network-accessible vulnerability with low integrity impact and no confidentiality or availability impact indicated by the supplied CVSS vectors. The affected product and technical cause are not identified. Published March 16, 2026, with a patch publication date of March 18, 2026.
A network-accessible vulnerability with low attack complexity and no required privileges or user interaction that can cause limited integrity impact in affected Huawei EulerOS Python OpenSSL (pyOpenSSL) packages.
A vulnerability affecting the pyOpenSSL-related packages in Huawei EulerOS UVP 2.11.1. The supplied advisory data does not specify the underlying flaw class; it indicates low integrity impact and no confidentiality or availability impact.
A named vulnerability referenced by a NewStart CGSL security-check plugin affecting the pyOpenSSL packages on ZTE CGSL Main 7. The content does not provide a technical vulnerability description.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.