CVE-2026-3783
token leak with redirect and netrc
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.
INFO
Published Date :
March 11, 2026, 11:16 a.m.
Last Modified :
March 12, 2026, 2:10 p.m.
Remotely Exploit :
Yes !
Source :
2499f714-1537-4658-8207-48ae4bb9eae9
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Update curl to a version that addresses this issue.
- Review and secure .netrc file configurations.
- Avoid using .netrc with sensitive credentials.
Public PoC/Exploit Available at Github
CVE-2026-3783 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-3783.
| URL | Resource |
|---|---|
| https://curl.se/docs/CVE-2026-3783.html | Patch Vendor Advisory |
| https://curl.se/docs/CVE-2026-3783.json | Vendor Advisory |
| https://hackerone.com/reports/3583983 | Exploit Issue Tracking Third Party Advisory |
| http://www.openwall.com/lists/oss-security/2026/03/11/2 | Mailing List Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-3783 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-3783
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Shell Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-3783 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-3783 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 12, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* versions from (including) 7.33.0 up to (excluding) 8.19.0 Added Reference Type CVE: http://www.openwall.com/lists/oss-security/2026/03/11/2 Types: Mailing List, Third Party Advisory Added Reference Type curl: https://curl.se/docs/CVE-2026-3783.html Types: Patch, Vendor Advisory Added Reference Type curl: https://curl.se/docs/CVE-2026-3783.json Types: Vendor Advisory Added Reference Type curl: https://hackerone.com/reports/3583983 Types: Exploit, Issue Tracking, Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 11, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Added CWE CWE-522 -
New CVE Received by 2499f714-1537-4658-8207-48ae4bb9eae9
Mar. 11, 2026
Action Type Old Value New Value 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. Added Reference https://curl.se/docs/CVE-2026-3783.html Added Reference https://curl.se/docs/CVE-2026-3783.json Added Reference https://hackerone.com/reports/3583983 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Mar. 11, 2026
Action Type Old Value New Value Added Reference http://www.openwall.com/lists/oss-security/2026/03/11/2