Vulnerability · Published May 13, 2026 · Assigned by curl
CVE-2026-7168cross-proxy Digest auth state leak
Medium 5.3
In plain English
A medium-severity security flaw in curl from curl. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% 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 59.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Successfully using libcurl to do a transfer over a specific HTTP proxy (`proxyA`) with **Digest** authentication and then changing the proxy host to a second one (`proxyB`) for a second transfer, reusing the same handle, makes libcurl wrongly pass on the `Proxy-Authorization:` header field meant for `proxyA`, to `proxyB`.
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-2026-7168 |
| Alpine:v3.22 | curl | 8.14.1-r4 | ALPINE-CVE-2026-7168 |
| Alpine:v3.23 | curl | 8.20.0-r0 | ALPINE-CVE-2026-7168 |
| Alpine:v3.24 | curl | 8.20.0-r0 | ALPINE-CVE-2026-7168 |
| Debian:12 | curl | 7.88.1-10+deb12u15 | DEBIAN-CVE-2026-7168 |
| Debian:13 | curl | 8.14.1-2+deb13u4 | DEBIAN-CVE-2026-7168 |
| Debian:14 | curl | 8.20.0-1 | DEBIAN-CVE-2026-7168 |
| 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-2026-7168 |
| Ubuntu:24.04:LTS | curl | 8.5.0-2ubuntu10.9 | UBUNTU-CVE-2026-7168 |
| Ubuntu:25.10 | curl | 8.14.1-2ubuntu1.3 | UBUNTU-CVE-2026-7168 |
| Ubuntu:26.04:LTS | curl | 8.18.0-1ubuntu2.1 | UBUNTU-CVE-2026-7168 |
Affected products (as reported)
Weakness: CWE-294 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N