libcurl might in some circumstances reuse the wrong connection when asked to
do Negotiate-authenticated ones, even when they are set to use different
'services'.

libcurl features a pool of recent connections so that subsequent requests can
reuse an existing connection to avoid overhead.

When reusing a connection a range of criteria must be met. Due to a logical
error in the code, a request that was issued by an application could
wrongfully reuse an existing connection to the same server that was
authenticated using different services.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

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 0.00315.

Exploitation poc

Automatable no

Technical Impact partial

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 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

No data.

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Curl Subscribe
Curl Subscribe

Project Subscriptions

Vendors Products
Curl Subscribe
Curl Subscribe
Advisories
Source ID Title
Ubuntu USN Ubuntu USN USN-8487-1 curl vulnerabilities
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://curl.se/docs/CVE-2026-8458.html cve-icon
https://curl.se/docs/CVE-2026-8458.json cve-icon
https://hackerone.com/reports/3721183 cve-icon cve-icon
History

Sun, 26 Jul 2026 23:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Fri, 24 Jul 2026 18:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Fri, 17 Jul 2026 02:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Sun, 12 Jul 2026 18:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Sat, 11 Jul 2026 16:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Fri, 10 Jul 2026 16:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Thu, 09 Jul 2026 14:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Wed, 08 Jul 2026 17:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-862

Wed, 08 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-862

Tue, 07 Jul 2026 12:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-269
CWE-285

Mon, 06 Jul 2026 22:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-269
CWE-285

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

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 06 Jul 2026 13:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-640

Mon, 06 Jul 2026 01:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-640

Sun, 05 Jul 2026 20:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Sun, 05 Jul 2026 12:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Sun, 05 Jul 2026 01:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Sat, 04 Jul 2026 09:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Sat, 04 Jul 2026 05:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-285

Fri, 03 Jul 2026 17:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-285

Fri, 03 Jul 2026 08:00:00 +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 libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different 'services'. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the code, a request that was issued by an application could wrongfully reuse an existing connection to the same server that was authenticated using different services.
Title wrong reuse for different services
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published:

Updated: 2026-07-06T17:32:06.018Z

Reserved: 2026-05-13T08:33:36.632Z

Link: CVE-2026-8458

cve-icon Vulnrichment

Updated: 2026-07-06T17:31:59.712Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-26T23:00:06Z

Weaknesses