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CVE-2026-92389 is a transfer-direction validation vulnerability in libcurl's TFTP state machine affecting curl versions earlier than 8.23.0. The state machine accepts opening server responses for read and write transfers interchangeably instead of validating them against the requested transfer direction. A malicious TFTP server can consequently force a client into transmit mode during an intended read transfer, potentially exposing sensitive information. The curl project classifies the vulnerability as low severity.
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A low-severity information disclosure vulnerability in libcurl's TFTP state machine. A malicious TFTP server can force a download request into transmit mode, causing libcurl to read and transmit data through the handle's persistent CURLOPT_READDATA pointer. This can expose data from unrelated prior operations, such as an HTTP POST performed using a reused handle. The reported CVSS v3.1 score is 3.7 (AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N). Fixes are pending for the listed Amazon Linux packages.
Referenced by an Ubuntu local security check covering curl packages. No individual technical description or vulnerability-specific exploit availability is provided.
Insufficient transfer-direction validation in libcurl's TFTP state machine allows a malicious server to force the client into transmit mode, potentially exposing sensitive information.
A critical vulnerability affecting curl and related packages, identified by Tenable Cloud Security plugin 476143. The listed CVSS v3 score is 9.8, indicating network exploitation without privileges or user interaction and potentially high confidentiality, integrity, and availability impacts. The content does not describe the underlying flaw. A patch was published on October 14, 2026.
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