Vulnerability · Published May 13, 2026 · Assigned by curl
CVE-2026-6429netrc credential leak with reused proxy connection
Medium 5.3
In plain English
A medium-severity information exposure in curl from curl. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.5%top 55.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | curl | 8.12.1-4.el10_2.7 | ALSA-2026:80512 |
| AlmaLinux:10 | libcurl | 8.12.1-4.el10_2.7 | ALSA-2026:80512 |
| AlmaLinux:10 | libcurl-devel | 8.12.1-4.el10_2.7 | ALSA-2026:80512 |
| AlmaLinux:10 | libcurl-minimal | 8.12.1-4.el10_2.7 | ALSA-2026:80512 |
| Alpine:v3.21 | curl | 8.14.1-r3 | ALPINE-CVE-2026-6429 |
| Alpine:v3.22 | curl | 8.14.1-r4 | ALPINE-CVE-2026-6429 |
| Alpine:v3.23 | curl | 8.20.0-r0 | ALPINE-CVE-2026-6429 |
| Alpine:v3.24 | curl | 8.20.0-r0 | ALPINE-CVE-2026-6429 |
| Debian:12 | curl | no fix listed | DEBIAN-CVE-2026-6429 |
| Debian:13 | curl | 8.14.1-2+deb13u4 | DEBIAN-CVE-2026-6429 |
| Debian:14 | curl | 8.20.0~rc3-1 | DEBIAN-CVE-2026-6429 |
| Rocky Linux:10 | curl | 0:8.12.1-4.el10_2.7 | RLSA-2026:80512 |
| Ubuntu:22.04:LTS | curl | 7.81.0-1ubuntu1.24 | UBUNTU-CVE-2026-6429 |
| Ubuntu:24.04:LTS | curl | 8.5.0-2ubuntu10.9 | UBUNTU-CVE-2026-6429 |
| Ubuntu:25.10 | curl | 8.14.1-2ubuntu1.3 | UBUNTU-CVE-2026-6429 |
| Ubuntu:26.04:LTS | curl | 8.18.0-1ubuntu2.1 | UBUNTU-CVE-2026-6429 |
Affected products (as reported)
Weakness: CWE-200 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N