Vulnerability · Published Sep 6, 2026 · Assigned by curl
CVE-2026-80230OpenSSL pinning bypass
High 7.5
In plain English
A high-severity improper certificate validation in curl from curl. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
When `CURLOPT_PINNEDPUBLICKEY` is configured alongside options that disable standard peer verification (`CURLOPT_SSL_VERIFYPEER = 0` and `CURLOPT_SSL_VERIFYHOST = 0`), libcurl fails to enforce public key pinning on connections established without a presented server certificate. Bypassing the pinning check under these disabled-verification conditions allows unauthenticated connections to succeed when they should be rejected.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | curl | 8.22.0-r0 | ALPINE-CVE-2026-80230 |
| Alpine:v3.24 | curl | 8.22.0-r0 | ALPINE-CVE-2026-80230 |
| Debian:12 | curl | no fix listed | DEBIAN-CVE-2026-80230 |
| Debian:13 | curl | no fix listed | DEBIAN-CVE-2026-80230 |
| Debian:14 | curl | 8.22.0~rc3-1 | DEBIAN-CVE-2026-80230 |
| Ubuntu:22.04:LTS | curl | 7.81.0-1ubuntu1.29 | UBUNTU-CVE-2026-80230 |
| Ubuntu:22.04:LTS | curl | 7.81.0-1ubuntu1.29 | USN-8820-1 |
| Ubuntu:24.04:LTS | curl | 8.5.0-2ubuntu10.15 | USN-8820-1 |
| Ubuntu:24.04:LTS | curl | 8.5.0-2ubuntu10.15 | UBUNTU-CVE-2026-80230 |
| Ubuntu:26.04:LTS | curl | 8.18.0-1ubuntu2.7 | USN-8820-1 |
| Ubuntu:26.04:LTS | curl | 8.18.0-1ubuntu2.7 | UBUNTU-CVE-2026-80230 |
| Ubuntu:26.10 | curl | 8.20.0-2ubuntu11 | UBUNTU-CVE-2026-80230 |
Affected products (as reported)
Weakness: CWE-295 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H