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CVE-2026-86415

7.5 · HIGH

libcurl's connection cache match function never considers the automatic client certificate option, so a cached, already authenticated Schannel connection can be handed to a transfer that got redire…

Published Oct 20, 2026CWE-201EPSS 0.42%

Overview

CVE-2026-86415 is a high-severity vulnerability. It was published on October 20, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

libcurl's connection cache match function never considers the automatic client

certificate option, so a cached, already authenticated Schannel connection can

be handed to a transfer that got redirected to a different origin, even though

the code explicitly switched off the auto client cert option for that transfer

to prevent exactly this.

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-2026-86415.htmlRefcurl.se/docs/CVE-2026-86415.jsonRefhackerone.com/reports/3993870

How CyberStrike helps

Frequently asked questions

What is CVE-2026-86415?

CVE-2026-86415 is a high-severity vulnerability. It was published on October 20, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-86415?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-86415?

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-2026-86415?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-86415 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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