CVE-2026-3783
Last modified
CVE-2026-3783 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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.. EPSS estimates a 0.33% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Curl | >= 7.33.0, < 8.19.0 |
References
- https://curl.se/docs/CVE-2026-3783.htmlPatch, Vendor Advisory
- https://curl.se/docs/CVE-2026-3783.jsonVendor Advisory
- https://hackerone.com/reports/3583983Exploit, Issue Tracking, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2026/03/11/2Mailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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