Medium severity · published May 13, 2026
CVE-2026-6429
netrc credential leak with reused proxy connection
5.3
CVSS
0.5%
EPSS
No
On KEV
Description
When asked to both use a `.netrc` file for credentials and to follow HTTP
redirects, libcurl could leak the password used for the first host to the
followed-to host under certain circumstances.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CU
curl · curl
7.14.0 before 8.14.2; 8.15.0 before 8.16.1; 8.17.0 before 8.20.0; 01165e08e0d131b399fba2190f17af67e66f0888 before b4024bf808bd558026fdc6096e8457f199ace306; 8.19.0; 8.18.0; +34 more · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6429
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-6429
Patch
https://curl.se/docs/CVE-2026-6429.html
Product
https://curl.se/docs/CVE-2026-6429.json
Exploit
https://hackerone.com/reports/3677759
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