Is CVE-2026-27448 actively exploited?

No active exploitation of CVE-2026-27448 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-27448 be exploited remotely?

Yes. CVE-2026-27448 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-27448?

CVE-2026-27448 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-27448

CWE-636Published: March 18, 2026· Updated: Mar 23, 2026

5.3

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:11.8th

Official Description

pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.

NVD Source

Technical Analysis

CVE-2026-27448 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.