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CVE-2026-8458

6.5 · MEDIUM

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'.

Published Jul 3, 2026EPSS 0.37%

Overview

CVE-2026-8458 is a medium-severity vulnerability. It was published on July 3, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcurl.se/docs/CVE-2026-8458.htmlRefcurl.se/docs/CVE-2026-8458.jsonRefhackerone.com/reports/3721183Refhackerone.com/reports/3721183

How CyberStrike helps

Frequently asked questions

What is CVE-2026-8458?

CVE-2026-8458 is a medium-severity vulnerability. It was published on July 3, 2026 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-8458?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-8458?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-8458?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-8458 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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