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

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.

The EPSS score is 0.00016.

Exploitation poc

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
curl curl unaffected
Version Status Constraints
8.18.0 affected
≤ 8.18.0
8.17.0 affected
≤ 8.17.0
8.16.0 affected
≤ 8.16.0
8.15.0 affected
≤ 8.15.0
8.14.1 affected
≤ 8.14.1
8.14.0 affected
≤ 8.14.0
8.13.0 affected
≤ 8.13.0
8.12.1 affected
≤ 8.12.1
8.12.0 affected
≤ 8.12.0
8.11.1 affected
≤ 8.11.1
8.11.0 affected
≤ 8.11.0
8.10.1 affected
≤ 8.10.1
8.10.0 affected
≤ 8.10.0
8.9.1 affected
≤ 8.9.1
8.9.0 affected
≤ 8.9.0
8.8.0 affected
≤ 8.8.0
8.7.1 affected
≤ 8.7.1
8.7.0 affected
≤ 8.7.0
8.6.0 affected
≤ 8.6.0
8.5.0 affected
≤ 8.5.0
8.4.0 affected
≤ 8.4.0
8.3.0 affected
≤ 8.3.0
8.2.1 affected
≤ 8.2.1
8.2.0 affected
≤ 8.2.0
8.1.2 affected
≤ 8.1.2
8.1.1 affected
≤ 8.1.1
8.1.0 affected
≤ 8.1.0
8.0.1 affected
≤ 8.0.1
8.0.0 affected
≤ 8.0.0
7.88.1 affected
≤ 7.88.1
7.88.0 affected
≤ 7.88.0
7.87.0 affected
≤ 7.87.0
7.86.0 affected
≤ 7.86.0
7.85.0 affected
≤ 7.85.0
7.84.0 affected
≤ 7.84.0
7.83.1 affected
≤ 7.83.1
7.83.0 affected
≤ 7.83.0
7.82.0 affected
≤ 7.82.0
7.81.0 affected
≤ 7.81.0
7.80.0 affected
≤ 7.80.0
7.79.1 affected
≤ 7.79.1
7.79.0 affected
≤ 7.79.0
7.78.0 affected
≤ 7.78.0
7.77.0 affected
≤ 7.77.0
7.76.1 affected
≤ 7.76.1
7.76.0 affected
≤ 7.76.0
7.75.0 affected
≤ 7.75.0
7.74.0 affected
≤ 7.74.0
7.73.0 affected
≤ 7.73.0
7.72.0 affected
≤ 7.72.0
7.71.1 affected
≤ 7.71.1
7.71.0 affected
≤ 7.71.0
7.70.0 affected
≤ 7.70.0
7.69.1 affected
≤ 7.69.1
7.69.0 affected
≤ 7.69.0
7.68.0 affected
≤ 7.68.0
7.67.0 affected
≤ 7.67.0
7.66.0 affected
≤ 7.66.0
7.65.3 affected
≤ 7.65.3
7.65.2 affected
≤ 7.65.2
7.65.1 affected
≤ 7.65.1
7.65.0 affected
≤ 7.65.0
7.64.1 affected
≤ 7.64.1
7.64.0 affected
≤ 7.64.0
7.63.0 affected
≤ 7.63.0
7.62.0 affected
≤ 7.62.0
7.61.1 affected
≤ 7.61.1
7.61.0 affected
≤ 7.61.0
7.60.0 affected
≤ 7.60.0
7.59.0 affected
≤ 7.59.0
7.58.0 affected
≤ 7.58.0
7.57.0 affected
≤ 7.57.0
7.56.1 affected
≤ 7.56.1
7.56.0 affected
≤ 7.56.0
7.55.1 affected
≤ 7.55.1
7.55.0 affected
≤ 7.55.0
7.54.1 affected
≤ 7.54.1
7.54.0 affected
≤ 7.54.0
7.53.1 affected
≤ 7.53.1
7.53.0 affected
≤ 7.53.0
7.52.1 affected
≤ 7.52.1
7.52.0 affected
≤ 7.52.0
7.51.0 affected
≤ 7.51.0
7.50.3 affected
≤ 7.50.3
7.50.2 affected
≤ 7.50.2
7.50.1 affected
≤ 7.50.1
7.50.0 affected
≤ 7.50.0
7.49.1 affected
≤ 7.49.1
7.49.0 affected
≤ 7.49.0
7.48.0 affected
≤ 7.48.0
7.47.1 affected
≤ 7.47.1
7.47.0 affected
≤ 7.47.0
7.46.0 affected
≤ 7.46.0
7.45.0 affected
≤ 7.45.0
7.44.0 affected
≤ 7.44.0
7.43.0 affected
≤ 7.43.0
7.42.1 affected
≤ 7.42.1
7.42.0 affected
≤ 7.42.0
7.41.0 affected
≤ 7.41.0
7.40.0 affected
≤ 7.40.0
7.39.0 affected
≤ 7.39.0
7.38.0 affected
≤ 7.38.0
7.37.1 affected
≤ 7.37.1
7.37.0 affected
≤ 7.37.0
7.36.0 affected
≤ 7.36.0
7.35.0 affected
≤ 7.35.0
7.34.0 affected
≤ 7.34.0
7.33.0 affected
≤ 7.33.0

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories
Source ID Title
Ubuntu USN Ubuntu USN USN-8084-1 curl vulnerabilities
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 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

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

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published:

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 : Awaiting Analysis

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

Modified: 2026-03-11T15:16:33.117

Link: CVE-2026-3783

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses