CVE-2026-8286 - Vulnerability Details

- wrong STARTTLS connection reuse

Description

A vulnerability exists where a new transfer that uses STARTTLS to upgrade the
connection might reuse an existing live connection even though the TLS
configuration mismatches so it should not.

Published: 2026-07-03

Score: 8.1 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
`8.20.0`	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
`7.44.0`	affected	≤ 7.44.0
`7.43.0`	affected	≤ 7.43.0
`7.42.1`	affected	≤ 7.42.1
`7.42.0`	affected	≤ 7.42.0
`7.41.0`	affected	≤ 7.41.0
`7.40.0`	affected	≤ 7.40.0
`7.39.0`	affected	≤ 7.39.0
`7.38.0`	affected	≤ 7.38.0
`7.37.1`	affected	≤ 7.37.1
`7.37.0`	affected	≤ 7.37.0
`7.36.0`	affected	≤ 7.36.0
`7.35.0`	affected	≤ 7.35.0
`7.34.0`	affected	≤ 7.34.0
`7.33.0`	affected	≤ 7.33.0
`7.32.0`	affected	≤ 7.32.0
`7.31.0`	affected	≤ 7.31.0
`7.30.0`	affected	≤ 7.30.0

No data.

Vendor Product Confidence Versions

Curl

100%

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

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Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

Source	ID	Title
Ubuntu USN	USN-8487-1	curl vulnerabilities

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00413.

Exploitation poc

Automatable no

Technical Impact total

References

Link	Providers
https://curl.se/docs/CVE-2026-8286.html
https://curl.se/docs/CVE-2026-8286.json
https://hackerone.com/reports/3718195
https://nvd.nist.gov/vuln/detail/CVE-2026-8286
https://www.cve.org/CVERecord?id=CVE-2026-8286

History

Tue, 07 Jul 2026 00:15:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-295
References		https://nvd.nist.gov/vuln/detail/CVE-2026-8286 https://www.cve.org/CVERecord?id=CVE-2026-8286
Metrics	threat_severity `None`	threat_severity `Important`

Mon, 06 Jul 2026 18:30:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Sun, 05 Jul 2026 17:30:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-703

Sun, 05 Jul 2026 05:00:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-703

Sat, 04 Jul 2026 17:15:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-284 CWE-295

Sat, 04 Jul 2026 12:45:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-284 CWE-295

Fri, 03 Jul 2026 21:00:00 +0000

Type	Values Removed	Values Added
Weaknesses	CWE-200 CWE-311

Fri, 03 Jul 2026 10:00:00 +0000

Type	Values Removed	Values Added
Weaknesses		CWE-200 CWE-311

Fri, 03 Jul 2026 09:00:00 +0000

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

Fri, 03 Jul 2026 06:45:00 +0000

Type	Values Removed	Values Added
Description		A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.
Title		wrong STARTTLS connection reuse
References		https://curl.se/docs/CVE-2026-8286.html https://curl.se/docs/CVE-2026-8286.json https://hackerone.com/reports/3718195

Subscriptions

Curl Curl

MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-07-03T06:14:17.541Z

Updated: 2026-07-06T17:33:50.416Z

Reserved: 2026-05-11T07:06:37.906Z

Link: CVE-2026-8286

Vulnrichment

Updated: 2026-07-06T17:33:45.469Z

NVD

No data.

Redhat

Severity : Important

Publid Date: 2026-07-03T06:14:17Z

Links: CVE-2026-8286 - Bugzilla

OpenCVE Enrichment

Updated: 2026-07-08T06:45:16Z

Weaknesses

CWE-295

Tracking

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

Exploitation poc

Automatable no

Technical Impact total

Subscriptions

JSON object

JSON object

JSON object

JSON object

JSON object