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

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Curl
  • Curl
Haxx
  • Curl

Configuration 1 [-]

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

No data.

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

Thu, 12 Mar 2026 14:15:00 +0000

Type Values Removed Values Added
First Time appeared Haxx
Haxx curl
CPEs cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
Vendors & Products Haxx
Haxx curl

Thu, 12 Mar 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Curl
Curl curl
Vendors & Products Curl
Curl curl

Wed, 11 Mar 2026 15:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-522
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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

Type Values Removed Values Added
References

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
cve-icon MITRE

Status: PUBLISHED

Assigner: curl

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

Updated: 2026-03-11T14:26:10.788Z

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

Link: CVE-2026-3783

cve-icon Vulnrichment

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

cve-icon NVD

Status : Analyzed

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

Modified: 2026-03-12T14:10:37.300

Link: CVE-2026-3783

cve-icon Redhat

No data.