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The detailed study of the Galactic bulge stellar population necessarilyrequires an accurate representation of the interstellar extinction particularlytoward the Galactic plane and center, where the severe and differentialreddening is expected to vary on sub-arcmin scales. Although recent infraredsurveys have addressed this problem by providing extinction maps across thewhole Galactic bulge area, dereddened color-magnitude diagrams near the planeand center appear systematically undercorrected, suggesting the need for higherresolutions. These undercorrections affect any stellar study sensitive to color(e.g. star formation history analysis via color-magnitude diagram fitting),either making them inaccurate or limiting them to small low/stable extinctionwindows where this value is better constrained. We aim at providing ahigh-resolution (2 arcmin to $\sim$ 10 arcsec) color excess map for the VVVbulge area, in $\mathrm{J}-\mathrm{K}_s$ color. We use the MW-BULGE-PSFPHOTcatalogs sampling $\sim$ 300 deg$^2$ across the Galactic bulge ($|l| <10^\circ$ and $-10^\circ < b < 5^\circ$) to isolate a sample of red clump andred giant branch stars, for which we calculate average$\mathrm{J}-\mathrm{K}_s$ color in a fine spatial grid in $(l, b)$ space. Weobtain a E$(\mathrm{J}-\mathrm{K}_s)$ map spanning the VVV bulge area ofroughly 300 deg$^2$, with the equivalent to a resolution between $\sim$ 1arcmin for bulge outskirts ($l < -6^\circ$) to below 20 arcsec within thecentral $|l| < 1^\circ$, and below 10 arcsec for the innermost area ($|l| <1^\circ$ and $|b| < 3^\circ$). The result is publicly available athttp://basti-iac.oa-teramo.inaf.it/vvvexmap/

Mapping the stellar age of the Milky Way bulge with the VVV. III. High resolution reddening map