Vulnerability · Published Jul 3, 2026 · Assigned by curl
CVE-2026-9079stale proxy password leak
Critical 9.8
In plain English
A critical-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 1.1% (higher than 65% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)1.1%top 35.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
libcurl had a flaw that when instructed to clear proxy authentication credentials which made it not do so, leaving the old credentials around to get used for subsequent transfers that should not know nor use them.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:10 | curl | 8.12.1-4.el10_2.6 | ALSA-2026:69125 |
| AlmaLinux:10 | libcurl | 8.12.1-4.el10_2.6 | ALSA-2026:69125 |
| AlmaLinux:10 | libcurl-devel | 8.12.1-4.el10_2.6 | ALSA-2026:69125 |
| AlmaLinux:10 | libcurl-minimal | 8.12.1-4.el10_2.6 | ALSA-2026:69125 |
| Alpine:v3.23 | curl | 8.22.0-r0 | ALPINE-CVE-2026-9079 |
| Alpine:v3.24 | curl | 8.21.0-r0 | ALPINE-CVE-2026-9079 |
| Debian:13 | curl | no fix listed | DEBIAN-CVE-2026-9079 |
| Debian:14 | curl | 8.21.0~rc2-1 | DEBIAN-CVE-2026-9079 |
| Rocky Linux:10 | curl | 0:8.12.1-4.el10_2.6 | RLSA-2026:69125 |
| Ubuntu:25.10 | curl | 8.14.1-2ubuntu1.4 | UBUNTU-CVE-2026-9079 |
| Ubuntu:26.04:LTS | curl | 8.18.0-1ubuntu2.2 | UBUNTU-CVE-2026-9079 |
Affected products (as reported)
Weakness: CWE-522 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H