Curl

CVE-2026-92389: libcurl's TFTP state machine fails to validate state transitions against the requested transfer direction, accepting opening server responses for both reads and

CVE-2026-92389 Oct 20, 2026 Source: Vendor

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

Source of record The credited names below are quoted verbatim from the vendor's own advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-92389

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CVE-2026-92389 BR2026-0000-029449 unclaimed

Credited as Joshua Rogers (Aisle Research)