CVE-2026-92389

Name	CVE-2026-92389
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 (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
curl (PTS)	bookworm	7.88.1-10+deb12u15	vulnerable
	bookworm (security)	7.88.1-10+deb12u5	vulnerable
	trixie	8.14.1-2+deb13u5	vulnerable
	trixie (security)	8.14.1-2+deb13u7	vulnerable
	forky	8.22.0-1	vulnerable
	sid	8.23.0-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
curl	source	(unstable)	8.23.0~rc1-1

Notes

[trixie] - curl <no-dsa> (Minor issue)
[bookworm] - curl <postponed> (Minor issue; can be fixed with next release)
https://curl.se/docs/CVE-2026-92389.html
Introduced with: https://github.com/curl/curl/commit/56d9624b566ac15ffb4b4b6eef220a5000b767e0 (curl-7_15_0)
https://github.com/curl/curl/commit/63dd390fab905a239a97e2700532929343ebc4e9 (rc-8_23_0-1)