What is CVE-2026-6429?

CVE-2026-6429 is a medium-severity vulnerability in Curl, classified under CWE-200 EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED ACTOR. CVSS score: 5.3/10. Published 2026-05-13.

How severe is CVE-2026-6429?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Curl

CVE-2026-6429

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.

EPSS: 0.000 (6.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.

Affected products

Curl — versions 8.19.0, 8.18.0, 8.17.0
Haxx Curl

References

2499f714-1537-4658-8207-48ae4bb9eae9 (Product)
2499f714-1537-4658-8207-48ae4bb9eae9 (Patch, Vendor Advisory)
2499f714-1537-4658-8207-48ae4bb9eae9 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2026-6429?: CVE-2026-6429 is a medium-severity vulnerability in Curl, classified under CWE-200 EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED ACTOR. CVSS score: 5.3/10. Published 2026-05-13.
How severe is CVE-2026-6429?: Medium severity. CVSS v3 base score is 5.3 out of 10.