Early James Webb Space Telescope (JWST) observations reveal an unexpectedly abundant population of high-redshift candidate massive galaxies at $z\gtrsim 7$, and recent Dark Energy Spectroscopic Instrument (DESI) measurements show a preference for dynamical dark energy, which together present a significant challenge to the standard $\mathrm{\Lambda }$ cold dark matter ($\mathrm{\Lambda }\mathrm{CDM}$) cosmology. In this work, we jointly analyze high-redshift galaxy data from JWST, baryon acoustic oscillations data from DESI Data Release 2 (DR2), and cosmic microwave background (CMB) data from Planck and Atacama Cosmology Telescope (ACT), measuring the total neutrino mass $\sum m_{\nu }$. We consider three dark energy models ($\mathrm{\Lambda }\mathrm{CDM}$, $w\mathrm{CDM}$, and $w_0{w}_a\mathrm{CDM}$) and three mass hierarchies. Our results indicate that in the $w_0{w}_a\mathrm{CDM}$ model, adding JWST data to $\mathrm{CMB}+\mathrm{DESI}$ tightens the upper limit of $\sum m_{\nu }$ by about 5.8%–10.2%, and we obtain $\sum m_{\nu }<0.167\mathrm{eV}$ ($2\sigma$) in the normal hierarchy (NH) case. Furthermore, JWST also offers indicative lower limits on star formation efficiency parameter of $f_{*,10}\gtrsim 0.146–0.161$. Bayesian evidence weakly favors the $w_0{w}_a\mathrm{CDM}+\sum m_{\nu }(\mathrm{NH})$ model relative to the $\mathrm{\Lambda }\mathrm{CDM}+\sum m_{\nu }(\mathrm{NH})$ model using $\mathrm{CMB}+\mathrm{DESI}+\mathrm{JWST}$ data. These results suggest that the joint analysis of high-redshift JWST data and low-redshift DESI data provides useful constraints on neutrino mass and merits further investigation.

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• Cosmological parameters
• Cosmology
• Dark energy
• Neutrino mass