VulnerabilityAnalyzed

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.

MEDIUM 5.3EPSS 0.52%

Does this matter?

Lower severity and a low EPSS score (0.52%). Track it; it rarely justifies an emergency change on its own.

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 3.1: 5.3 MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS: 0.52% probability · 43th percentile
CISA KEV: Not listed
Affected: haxx/curl
Source: 2499f714-1537-4658-8207-48ae4bb9eae9

References

https://curl.se/docs/CVE-2026-6429.htmlPatch, Vendor Advisory
https://curl.se/docs/CVE-2026-6429.jsonProduct
https://hackerone.com/reports/3677759Exploit, Issue Tracking, Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.