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.

Why is this CVE low priority?

Upstream defined this as low severity

Learn more about Ubuntu priority

Status

Show unmaintained releases

Package	Ubuntu Release	Status
curl	26.10 stonking	Fixed in 8.20.0-2ubuntu11.1
	26.04 LTS resolute	Fixed in 8.18.0-1ubuntu2.8
	24.04 LTS noble	Fixed in 8.5.0-2ubuntu10.16
	22.04 LTS jammy	Fixed in 7.81.0-1ubuntu1.30
	20.04 LTS focal	Fixed in 7.68.0-1ubuntu2.25+esm10
	18.04 LTS bionic	Fixed in 7.58.0-2ubuntu3.24+esm15
	16.04 LTS xenial	Fixed in 7.47.0-1ubuntu2.19+esm21
	14.04 LTS trusty	Fixed in 7.35.0-1ubuntu2.20+esm24

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro 30-day free trial

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
curl	Upstream: 63dd390

References

Related Ubuntu Security Notices (USN)

USN-8927-1
curl vulnerabilities
14 October 2026

USN-8932-1
curl vulnerabilities
14 October 2026

USN-8927-2
curl vulnerabilities
19 October 2026