Wormholes that are traversable in principle offer fascinating insights into general relativity, yet they typically require exotic matter and suffer from stability issues. We construct a thin-shell wormhole by gluing two copies of a quantum-corrected, regular spacetime obtained from string $T$ duality. This regularization replaces the classical curvature singularity with a smooth core and introduces a fundamental length scale $l_0$. For the static configuration, we derive the surface stresses and show that, unlike the Schwarzschild case, the null and strong energy conditions can be satisfied for sufficiently large throat radii. A linearized stability analysis reveals a rich landscape: close to the minimum allowed throat radius, the configuration is unstable; at intermediate radii ($a\sim l_0$), the geometric stability threshold becomes negative, yielding a window of unconditional stability where any convex surface mass function suffices; at large radii, the wormhole recovers Schwarzschild-like behavior and stability requires a stiff equation of state. The $T$-duality scale $l_0$ is, thus, not merely a regularizer, but a key physical parameter that opens a novel region of unconditional stability absent in classical thin-shell wormholes. Our results suggest that quantum-gravity-motivated modifications can simultaneously cure singularities and make traversable wormholes dynamically viable, providing new targets for gravitational-wave astronomy and theoretical studies of exotic compact objects.

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• General relativity