CVE-2026-80230 - Vulnerability Details

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.

Published: 2026-09-06

Score: 7.5 High

EPSS: < 1% Very Low

KEV: No

Impact:

Action:

Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

curl

unaffected

Version	Status	Constraints
`8.21.0`	affected	≤ 8.21.0
`8.20.0`	affected	≤ 8.20.0
`8.19.0`	affected	≤ 8.19.0
`8.18.0`	affected	≤ 8.18.0
`8.17.0`	affected	≤ 8.17.0
`8.16.0`	affected	≤ 8.16.0
`8.15.0`	affected	≤ 8.15.0
`8.14.1`	affected	≤ 8.14.1
`8.14.0`	affected	≤ 8.14.0
`8.13.0`	affected	≤ 8.13.0
`8.12.1`	affected	≤ 8.12.1
`8.12.0`	affected	≤ 8.12.0
`8.11.1`	affected	≤ 8.11.1
`8.11.0`	affected	≤ 8.11.0
`8.10.1`	affected	≤ 8.10.1
`8.10.0`	affected	≤ 8.10.0
`8.9.1`	affected	≤ 8.9.1
`8.9.0`	affected	≤ 8.9.0
`8.8.0`	affected	≤ 8.8.0
`8.7.1`	affected	≤ 8.7.1
`8.7.0`	affected	≤ 8.7.0
`8.6.0`	affected	≤ 8.6.0
`8.5.0`	affected	≤ 8.5.0
`8.4.0`	affected	≤ 8.4.0
`8.3.0`	affected	≤ 8.3.0
`8.2.1`	affected	≤ 8.2.1
`8.2.0`	affected	≤ 8.2.0
`8.1.2`	affected	≤ 8.1.2
`8.1.1`	affected	≤ 8.1.1
`8.1.0`	affected	≤ 8.1.0
`8.0.1`	affected	≤ 8.0.1
`8.0.0`	affected	≤ 8.0.0
`7.88.1`	affected	≤ 7.88.1
`7.88.0`	affected	≤ 7.88.0
`7.87.0`	affected	≤ 7.87.0
`7.86.0`	affected	≤ 7.86.0
`7.85.0`	affected	≤ 7.85.0
`7.84.0`	affected	≤ 7.84.0
`7.83.1`	affected	≤ 7.83.1
`7.83.0`	affected	≤ 7.83.0
`7.82.0`	affected	≤ 7.82.0
`7.81.0`	affected	≤ 7.81.0
`7.80.0`	affected	≤ 7.80.0
`7.79.1`	affected	≤ 7.79.1
`7.79.0`	affected	≤ 7.79.0
`7.78.0`	affected	≤ 7.78.0
`7.77.0`	affected	≤ 7.77.0
`7.76.1`	affected	≤ 7.76.1
`7.76.0`	affected	≤ 7.76.0
`7.75.0`	affected	≤ 7.75.0
`7.74.0`	affected	≤ 7.74.0
`7.73.0`	affected	≤ 7.73.0
`7.72.0`	affected	≤ 7.72.0
`7.71.1`	affected	≤ 7.71.1
`7.71.0`	affected	≤ 7.71.0
`7.70.0`	affected	≤ 7.70.0
`7.69.1`	affected	≤ 7.69.1
`7.69.0`	affected	≤ 7.69.0
`7.68.0`	affected	≤ 7.68.0
`7.67.0`	affected	≤ 7.67.0
`7.66.0`	affected	≤ 7.66.0
`7.65.3`	affected	≤ 7.65.3
`7.65.2`	affected	≤ 7.65.2
`7.65.1`	affected	≤ 7.65.1
`7.65.0`	affected	≤ 7.65.0
`7.64.1`	affected	≤ 7.64.1
`7.64.0`	affected	≤ 7.64.0
`7.63.0`	affected	≤ 7.63.0
`7.62.0`	affected	≤ 7.62.0
`7.61.1`	affected	≤ 7.61.1
`7.61.0`	affected	≤ 7.61.0
`7.60.0`	affected	≤ 7.60.0
`7.59.0`	affected	≤ 7.59.0
`7.58.0`	affected	≤ 7.58.0
`7.57.0`	affected	≤ 7.57.0
`7.56.1`	affected	≤ 7.56.1
`7.56.0`	affected	≤ 7.56.0
`7.55.1`	affected	≤ 7.55.1
`7.55.0`	affected	≤ 7.55.0
`7.54.1`	affected	≤ 7.54.1
`7.54.0`	affected	≤ 7.54.0
`7.53.1`	affected	≤ 7.53.1
`7.53.0`	affected	≤ 7.53.0
`7.52.1`	affected	≤ 7.52.1
`7.52.0`	affected	≤ 7.52.0
`7.51.0`	affected	≤ 7.51.0
`7.50.3`	affected	≤ 7.50.3
`7.50.2`	affected	≤ 7.50.2
`7.50.1`	affected	≤ 7.50.1
`7.50.0`	affected	≤ 7.50.0
`7.49.1`	affected	≤ 7.49.1
`7.49.0`	affected	≤ 7.49.0
`7.48.0`	affected	≤ 7.48.0
`7.47.1`	affected	≤ 7.47.1
`7.47.0`	affected	≤ 7.47.0
`7.46.0`	affected	≤ 7.46.0
`7.45.0`	affected	≤ 7.45.0

Configuration 1 [-]

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

No data.

Vendor Product Confidence Versions

Curl

100%

Version	Status	Scheme	Platform
`[8.21.0,8.21.0]`	affected	semver	—
`[8.20.0,8.20.0]`	affected	semver	—
`[8.19.0,8.19.0]`	affected	semver	—
`[8.18.0,8.18.0]`	affected	semver	—
`[8.17.0,8.17.0]`	affected	semver	—
`[8.16.0,8.16.0]`	affected	semver	—
`[8.15.0,8.15.0]`	affected	semver	—
`[8.14.1,8.14.1]`	affected	semver	—
`[8.14.0,8.14.0]`	affected	semver	—
`[8.13.0,8.13.0]`	affected	semver	—
`[8.12.1,8.12.1]`	affected	semver	—
`[8.12.0,8.12.0]`	affected	semver	—
`[8.11.1,8.11.1]`	affected	semver	—
`[8.11.0,8.11.0]`	affected	semver	—
`[8.10.1,8.10.1]`	affected	semver	—
`[8.10.0,8.10.0]`	affected	semver	—
`[8.9.1,8.9.1]`	affected	semver	—
`[8.9.0,8.9.0]`	affected	semver	—
`[8.8.0,8.8.0]`	affected	semver	—
`[8.7.1,8.7.1]`	affected	semver	—
`[8.7.0,8.7.0]`	affected	semver	—
`[8.6.0,8.6.0]`	affected	semver	—
`[8.5.0,8.5.0]`	affected	semver	—
`[8.4.0,8.4.0]`	affected	semver	—
`[8.3.0,8.3.0]`	affected	semver	—
`[8.2.1,8.2.1]`	affected	semver	—
`[8.2.0,8.2.0]`	affected	semver	—
`[8.1.2,8.1.2]`	affected	semver	—
`[8.1.1,8.1.1]`	affected	semver	—
`[8.1.0,8.1.0]`	affected	semver	—
`[8.0.1,8.0.1]`	affected	semver	—
`[8.0.0,8.0.0]`	affected	semver	—
`[7.88.1,7.88.1]`	affected	semver	—
`[7.88.0,7.88.0]`	affected	semver	—
`[7.87.0,7.87.0]`	affected	semver	—
`[7.86.0,7.86.0]`	affected	semver	—
`[7.85.0,7.85.0]`	affected	semver	—
`[7.84.0,7.84.0]`	affected	semver	—
`[7.83.1,7.83.1]`	affected	semver	—
`[7.83.0,7.83.0]`	affected	semver	—
`[7.82.0,7.82.0]`	affected	semver	—
`[7.81.0,7.81.0]`	affected	semver	—
`[7.80.0,7.80.0]`	affected	semver	—
`[7.79.1,7.79.1]`	affected	semver	—
`[7.79.0,7.79.0]`	affected	semver	—
`[7.78.0,7.78.0]`	affected	semver	—
`[7.77.0,7.77.0]`	affected	semver	—
`[7.76.1,7.76.1]`	affected	semver	—
`[7.76.0,7.76.0]`	affected	semver	—
`[7.75.0,7.75.0]`	affected	semver	—
`[7.74.0,7.74.0]`	affected	semver	—
`[7.73.0,7.73.0]`	affected	semver	—
`[7.72.0,7.72.0]`	affected	semver	—
`[7.71.1,7.71.1]`	affected	semver	—
`[7.71.0,7.71.0]`	affected	semver	—
`[7.70.0,7.70.0]`	affected	semver	—
`[7.69.1,7.69.1]`	affected	semver	—
`[7.69.0,7.69.0]`	affected	semver	—
`[7.68.0,7.68.0]`	affected	semver	—
`[7.67.0,7.67.0]`	affected	semver	—
`[7.66.0,7.66.0]`	affected	semver	—
`[7.65.3,7.65.3]`	affected	semver	—
`[7.65.2,7.65.2]`	affected	semver	—
`[7.65.1,7.65.1]`	affected	semver	—
`[7.65.0,7.65.0]`	affected	semver	—
`[7.64.1,7.64.1]`	affected	semver	—
`[7.64.0,7.64.0]`	affected	semver	—
`[7.63.0,7.63.0]`	affected	semver	—
`[7.62.0,7.62.0]`	affected	semver	—
`[7.61.1,7.61.1]`	affected	semver	—
`[7.61.0,7.61.0]`	affected	semver	—
`[7.60.0,7.60.0]`	affected	semver	—
`[7.59.0,7.59.0]`	affected	semver	—
`[7.58.0,7.58.0]`	affected	semver	—
`[7.57.0,7.57.0]`	affected	semver	—
`[7.56.1,7.56.1]`	affected	semver	—
`[7.56.0,7.56.0]`	affected	semver	—
`[7.55.1,7.55.1]`	affected	semver	—
`[7.55.0,7.55.0]`	affected	semver	—
`[7.54.1,7.54.1]`	affected	semver	—
`[7.54.0,7.54.0]`	affected	semver	—
`[7.53.1,7.53.1]`	affected	semver	—
`[7.53.0,7.53.0]`	affected	semver	—
`[7.52.1,7.52.1]`	affected	semver	—
`[7.52.0,7.52.0]`	affected	semver	—
`[7.51.0,7.51.0]`	affected	semver	—
`[7.50.3,7.50.3]`	affected	semver	—
`[7.50.2,7.50.2]`	affected	semver	—
`[7.50.1,7.50.1]`	affected	semver	—
`[7.50.0,7.50.0]`	affected	semver	—
`[7.49.1,7.49.1]`	affected	semver	—
`[7.49.0,7.49.0]`	affected	semver	—
`[7.48.0,7.48.0]`	affected	semver	—
`[7.47.1,7.47.1]`	affected	semver	—
`[7.47.0,7.47.0]`	affected	semver	—
`[7.46.0,7.46.0]`	affected	semver	—
`[7.45.0,7.45.0]`	affected	semver	—

Found an issue or want to improve our Enrichment? You can suggest it directly by opening an issue on our dedicated GitHub repository .

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00401.

Exploitation poc

Automatable yes

Technical Impact partial

References

Link	Providers
https://curl.se/docs/CVE-2026-80230.html
https://curl.se/docs/CVE-2026-80230.json
https://hackerone.com/reports/3969300

History

Fri, 11 Sep 2026 23:45:00 +0000

Type	Values Removed	Values Added
First Time appeared		Haxx Haxx curl
CPEs		cpe:2.3:a:haxx:curl::::::::
Vendors & Products		Haxx Haxx curl

Tue, 08 Sep 2026 19:30:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}` ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Sun, 06 Sep 2026 21:15:00 +0000

Type	Values Removed	Values Added
First Time appeared		Curl Curl curl
Vendors & Products		Curl Curl curl

Sun, 06 Sep 2026 19:45:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-295

Sun, 06 Sep 2026 18:00:00 +0000

Type	Values Removed	Values Added
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.
Title		OpenSSL pinning bypass
References		https://curl.se/docs/CVE-2026-80230.html https://curl.se/docs/CVE-2026-80230.json https://hackerone.com/reports/3969300

Subscriptions

Curl Curl

Haxx Curl

MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-09-06T17:48:16.262Z

Updated: 2026-09-08T18:53:26.975Z

Reserved: 2026-08-26T04:24:25.568Z

Link: CVE-2026-80230

Vulnrichment

Updated: 2026-09-08T18:53:14.829Z

NVD

Status : Analyzed

Published: 2026-09-06T18:17:22.327

Modified: 2026-09-11T20:05:56.143

Link: CVE-2026-80230

Redhat

No data.

OpenCVE Enrichment

Updated: 2026-09-10T05:45:06Z

Weaknesses

CWE-295

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

Exploitation poc

Automatable yes

Technical Impact partial

Subscriptions

JSON object

JSON object

JSON object

JSON object

JSON object