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CVE-2026-3783— token leak with redirect and netrc

Quick assessment

Affected
curl curl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

curl是cURL开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl存在安全漏洞，该漏洞源于使用OAuth2承载令牌进行HTTP(S)传输时，在某些情况下可能将令牌泄露给第二个主机名。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.51% · P41

Affected Version Matrix 112

VendorProduct Version RangeStatus
curl curl 7.33.0< 8.14.2 affected
8.15.0< 8.16.1 affected
8.17.0< 8.19.0 affected
06c1bea72faabb6fad4b7ef818aafaa336c9a7aa< e3d7401a32a46516c9e5ee877e613e62ed35bddc affected
8.18.0 affected
8.17.0 affected
8.16.0 affected
8.15.0 affected
… +104 more rows
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I. Basic Information for CVE-2026-3783

Vulnerability Information
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Vulnerability Title
token leak with redirect and netrc
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不充分的凭证保护机制
Source: CVE Program / CVE List V5
Vulnerability Title
curl 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
curl是cURL开源的一款用于从服务器传输数据或向服务器传输数据的工具。 curl存在安全漏洞，该漏洞源于使用OAuth2承载令牌进行HTTP(S)传输时，在某些情况下可能将令牌泄露给第二个主机名。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
curl curl 7.33.0 ~ 8.14.2 -
curl curl 06c1bea72faabb6fad4b7ef818aafaa336c9a7aa ~ e3d7401a32a46516c9e5ee877e613e62ed35bddc -
curl curl 8.18.0 -

II. Public POCs for CVE-2026-3783

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III. Intelligence Information for CVE-2026-3783

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Vendor Advisories for CVE-2026-3783 (1)

Other References for CVE-2026-3783 (1)

Same Patch Batch · curl · 2026-03-11 · 4 CVEs total

CVE-2026-3805 use after free in SMB connection reuse
CVE-2026-3784 wrong proxy connection reuse with credentials
CVE-2026-1965 bad reuse of HTTP Negotiate connection

IV. Related Vulnerabilities

Same product: curl
Same vendor: curl
Same weakness: CWE-522

V. Comments for CVE-2026-3783

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