Medium5.4Red Hat & Ubuntu Linux
TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback
CVE-2026-27448 Published Mar 17, 2026
CVE-2026-27448
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
TLS connection bypass via unhandled callback exception in set_tlsext_servername_callback. Red Hat rates this moderate (CVSS 5.4). Weakness: CWE-636. Affected package(s): pyopenssl-main. Resolved in Red Hat advisory RHSA-2026:7224 — update the affected packages (`sudo dnf update`).
Affected versions
- pyopenssl-main-26.0.0-1.1.hum1
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Fixed versions
- RHSA-2026:7224
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Update the affected package(s) to the fixed version shipped in RHSA-2026:7224 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 1 day ago·verify at source
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