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CVE-2026-3783

medium CVSS 5.3 EPSS 0.5%

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.

Versions it affects

Software versions checked with the free lookup that CVE-2026-3783 applies to, and the release that fixes it where the sources name one.

curl 8.1.2 fixed in 8.14.2

At a glance

Severity
Medium
CVSS base score
5.3 out of 10
Known exploited
Not in CISA's catalogue of exploited vulnerabilities
EPSS
0.5% probability of exploitation in the next 30 days, higher than 43% of scored vulnerabilities
Weakness
CWE-522
Published
2026-03-11
NVD CVE.org

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