CVE-2026-3783 - Vulnerability Details - OpenCVE

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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

No data.

No data.

No data.

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
http://www.openwall.com/lists/oss-security/2026/03/11/2
https://curl.se/docs/CVE-2026-3783.html
https://curl.se/docs/CVE-2026-3783.json
https://hackerone.com/reports/3583983

History

Wed, 11 Mar 2026 11:30:00 +0000

Type	Values Removed	Values Added
References		http://www.openwall.com/lists/oss-security/2026/03/11/2

Wed, 11 Mar 2026 10:30:00 +0000

Type	Values Removed	Values Added
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.
Title		token leak with redirect and netrc
References		https://curl.se/docs/CVE-2026-3783.html https://curl.se/docs/CVE-2026-3783.json https://hackerone.com/reports/3583983

Projects

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MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-03-11T10:09:08.746Z

Updated: 2026-03-11T10:16:31.282Z

Reserved: 2026-03-08T05:09:09.891Z

Link: CVE-2026-3783

Vulnrichment

No data.

NVD

Status : Received

Published: 2026-03-11T11:16:00.080

Modified: 2026-03-11T11:16:00.080

Link: CVE-2026-3783

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

No weakness.

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[{"url": "https://curl.se/docs/CVE-2026-3783.json", "name": "json"}, {"url": "https://curl.se/docs/CVE-2026-3783.html", "name": "www"}, {"url": "https://hackerone.com/reports/3583983", "name": "issue"}], "credits": [{"lang": "en", "value": "spectreglobalsec on hackerone", "type": "finder"}, {"lang": "en", "value": "Daniel Stenberg", "type": "remediation developer"}]}, "adp": [{"title": "CVE Program Container", "references": [{"url": "http://www.openwall.com/lists/oss-security/2026/03/11/2"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2026-03-11T10:16:31.282Z"}}]}}