curl HTTP Redirect Leaks OAuth2 Bearer Token
CVE-2026-3783 Published on March 11, 2026
token leak with redirect and netrc
When an OAuth2 bearer token is used for an HTTP(S) transfer, and that transfer
performs a redirect to a second URL, curl could leak that token to the second
hostname under some circumstances.
If the hostname that the first request is redirected to has information in the
used .netrc file, with either of the `machine` or `default` keywords, curl
would pass on the bearer token set for the first host also to the second one.
Products Associated with CVE-2026-3783
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Affected Versions
curl:- Version 8.18.0, <= 8.18.0 is affected.
- Version 8.17.0, <= 8.17.0 is affected.
- Version 8.16.0, <= 8.16.0 is affected.
- Version 8.15.0, <= 8.15.0 is affected.
- Version 8.14.1, <= 8.14.1 is affected.
- Version 8.14.0, <= 8.14.0 is affected.
- Version 8.13.0, <= 8.13.0 is affected.
- Version 8.12.1, <= 8.12.1 is affected.
- Version 8.12.0, <= 8.12.0 is affected.
- Version 8.11.1, <= 8.11.1 is affected.
- Version 8.11.0, <= 8.11.0 is affected.
- Version 8.10.1, <= 8.10.1 is affected.
- Version 8.10.0, <= 8.10.0 is affected.
- Version 8.9.1, <= 8.9.1 is affected.
- Version 8.9.0, <= 8.9.0 is affected.
- Version 8.8.0, <= 8.8.0 is affected.
- Version 8.7.1, <= 8.7.1 is affected.
- Version 8.7.0, <= 8.7.0 is affected.
- Version 8.6.0, <= 8.6.0 is affected.
- Version 8.5.0, <= 8.5.0 is affected.
- Version 8.4.0, <= 8.4.0 is affected.
- Version 8.3.0, <= 8.3.0 is affected.
- Version 8.2.1, <= 8.2.1 is affected.
- Version 8.2.0, <= 8.2.0 is affected.
- Version 8.1.2, <= 8.1.2 is affected.
- Version 8.1.1, <= 8.1.1 is affected.
- Version 8.1.0, <= 8.1.0 is affected.
- Version 8.0.1, <= 8.0.1 is affected.
- Version 8.0.0, <= 8.0.0 is affected.
- Version 7.88.1, <= 7.88.1 is affected.
- Version 7.88.0, <= 7.88.0 is affected.
- Version 7.87.0, <= 7.87.0 is affected.
- Version 7.86.0, <= 7.86.0 is affected.
- Version 7.85.0, <= 7.85.0 is affected.
- Version 7.84.0, <= 7.84.0 is affected.
- Version 7.83.1, <= 7.83.1 is affected.
- Version 7.83.0, <= 7.83.0 is affected.
- Version 7.82.0, <= 7.82.0 is affected.
- Version 7.81.0, <= 7.81.0 is affected.
- Version 7.80.0, <= 7.80.0 is affected.
- Version 7.79.1, <= 7.79.1 is affected.
- Version 7.79.0, <= 7.79.0 is affected.
- Version 7.78.0, <= 7.78.0 is affected.
- Version 7.77.0, <= 7.77.0 is affected.
- Version 7.76.1, <= 7.76.1 is affected.
- Version 7.76.0, <= 7.76.0 is affected.
- Version 7.75.0, <= 7.75.0 is affected.
- Version 7.74.0, <= 7.74.0 is affected.
- Version 7.73.0, <= 7.73.0 is affected.
- Version 7.72.0, <= 7.72.0 is affected.
- Version 7.71.1, <= 7.71.1 is affected.
- Version 7.71.0, <= 7.71.0 is affected.
- Version 7.70.0, <= 7.70.0 is affected.
- Version 7.69.1, <= 7.69.1 is affected.
- Version 7.69.0, <= 7.69.0 is affected.
- Version 7.68.0, <= 7.68.0 is affected.
- Version 7.67.0, <= 7.67.0 is affected.
- Version 7.66.0, <= 7.66.0 is affected.
- Version 7.65.3, <= 7.65.3 is affected.
- Version 7.65.2, <= 7.65.2 is affected.
- Version 7.65.1, <= 7.65.1 is affected.
- Version 7.65.0, <= 7.65.0 is affected.
- Version 7.64.1, <= 7.64.1 is affected.
- Version 7.64.0, <= 7.64.0 is affected.
- Version 7.63.0, <= 7.63.0 is affected.
- Version 7.62.0, <= 7.62.0 is affected.
- Version 7.61.1, <= 7.61.1 is affected.
- Version 7.61.0, <= 7.61.0 is affected.
- Version 7.60.0, <= 7.60.0 is affected.
- Version 7.59.0, <= 7.59.0 is affected.
- Version 7.58.0, <= 7.58.0 is affected.
- Version 7.57.0, <= 7.57.0 is affected.
- Version 7.56.1, <= 7.56.1 is affected.
- Version 7.56.0, <= 7.56.0 is affected.
- Version 7.55.1, <= 7.55.1 is affected.
- Version 7.55.0, <= 7.55.0 is affected.
- Version 7.54.1, <= 7.54.1 is affected.
- Version 7.54.0, <= 7.54.0 is affected.
- Version 7.53.1, <= 7.53.1 is affected.
- Version 7.53.0, <= 7.53.0 is affected.
- Version 7.52.1, <= 7.52.1 is affected.
- Version 7.52.0, <= 7.52.0 is affected.
- Version 7.51.0, <= 7.51.0 is affected.
- Version 7.50.3, <= 7.50.3 is affected.
- Version 7.50.2, <= 7.50.2 is affected.
- Version 7.50.1, <= 7.50.1 is affected.
- Version 7.50.0, <= 7.50.0 is affected.
- Version 7.49.1, <= 7.49.1 is affected.
- Version 7.49.0, <= 7.49.0 is affected.
- Version 7.48.0, <= 7.48.0 is affected.
- Version 7.47.1, <= 7.47.1 is affected.
- Version 7.47.0, <= 7.47.0 is affected.
- Version 7.46.0, <= 7.46.0 is affected.
- Version 7.45.0, <= 7.45.0 is affected.
- Version 7.44.0, <= 7.44.0 is affected.
- Version 7.43.0, <= 7.43.0 is affected.
- Version 7.42.1, <= 7.42.1 is affected.
- Version 7.42.0, <= 7.42.0 is affected.
- Version 7.41.0, <= 7.41.0 is affected.
- Version 7.40.0, <= 7.40.0 is affected.
- Version 7.39.0, <= 7.39.0 is affected.
- Version 7.38.0, <= 7.38.0 is affected.
- Version 7.37.1, <= 7.37.1 is affected.
- Version 7.37.0, <= 7.37.0 is affected.
- Version 7.36.0, <= 7.36.0 is affected.
- Version 7.35.0, <= 7.35.0 is affected.
- Version 7.34.0, <= 7.34.0 is affected.
- Version 7.33.0, <= 7.33.0 is affected.