CVE-2026-3783
Medium
Description
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductHaxx Curl
PublishedMar 11, 2026
First seenMar 11, 2026
Weakness typeCWE-522CWE-522
How to fix
Update
- haxx curl8.19.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| haxx curl | 7.33.0 ≤ v < 8.19.0 | 8.19.0 |
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