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CVE-2026-92389

8.1 · HIGH

libcurl's TFTP state machine fails to validate state transitions against the requested transfer direction, accepting opening server responses for both reads and writes interchangeably.

Published Oct 20, 2026CWE-200EPSS 0.72%

Overview

CVE-2026-92389 is a high-severity vulnerability. It was published on October 20, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

libcurl's TFTP state machine fails to validate state transitions against the

requested transfer direction, accepting opening server responses for both

reads and writes interchangeably. A malicious TFTP server can respond to a

download request in a way that forces the client into transmit mode, prompting

libcurl to consume and transmit data from the handle's persistent

`CURLOPT_READDATA` pointer - including data remaining from unrelated prior

operations, such as an HTTP POST request executed on a reused handle.

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-2026-92389.htmlRefcurl.se/docs/CVE-2026-92389.jsonRefhackerone.com/reports/4022568Refhackerone.com/reports/4022568

How CyberStrike helps

Frequently asked questions

What is CVE-2026-92389?

CVE-2026-92389 is a high-severity vulnerability. It was published on October 20, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).

How severe is CVE-2026-92389?

This vulnerability has a CVSS 3.1 base score of 8.1, 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-2026-92389?

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-2026-92389?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-92389 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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