CVE-2026-92389— TFTP direction confusion
Quick assessment
Affected
curl curl
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
libcurl 的 TFTP 状态机未能根据请求的传输方向验证状态转换，导致其将用于读取和写入的服务器响应（即“打开服务器”响应）混为一谈地接受。恶意 TFTP 服务器可以针对下载请求作出响应，迫使客户端进入发送模式，从而诱导 libcurl 从句柄的持久化 指针中读取并发送数据——其中包括来自无关先前操作（例如在复用句柄上执行的 HTTP POST 请求）的残留数据。
Possible ATT&CK Techniques 2 AI
T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-92389
Vulnerability Information
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Vulnerability Title
TFTP direction confusion
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-92389
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-92389 (2)
Other References for CVE-2026-92389 (1)
Same Patch Batch · curl · 2026-10-20 · 23 CVEs total
| CVE-2026-92391 | curl_mime_free stack overflow by recursion | |
| CVE-2026-107928 | info leak uploading over WebSockets with GnuTLS | |
| CVE-2026-107929 | local interface connection reuse mixup | |
| CVE-2026-94266 | password leak in CURLINFO_EFFECTIVE_URL | |
| CVE-2026-94265 | Authorization: Negotiate sent to foreign origin | |
| CVE-2026-86415 | auto client cert connection reuse mixup | |
| CVE-2026-86414 | leaking host credentials to HTTP proxy | |
| CVE-2026-92390 | -J no-clobber guarantee bypassed with 103 early hints | |
| CVE-2026-92387 | never-ending loop via server response omission | |
| CVE-2026-92388 | FTP wildcard write callback mixup | |
| CVE-2026-92386 | server-set cookie aborts cookie jar load | |
| CVE-2026-86409 | stale SigV4 headers sent unintended | |
| CVE-2026-87865 | knownhost callback mismatches key as missing | |
| CVE-2026-87864 | IMAP APPEND plus CRLF conversion command injection | |
| CVE-2026-87863 | HSTS response erases persisted entries | |
| CVE-2026-87866 | wolfSSL public-key pinning bypass | |
| CVE-2026-87861 | cross-origin reuse of a Negotiate connection | |
| CVE-2026-87862 | HSTS cache import drops longer-lived child | |
| CVE-2026-86411 | FTP connection reuse inherits client-certificate | |
| CVE-2026-86412 | server-set cookie erases cookie jar |
Showing top 20 of 23 CVEs. View all on vendor page → →