CVE-2026-92389

Publication date 14 October 2026

Last updated 14 October 2026

Ubuntu priority

Low

Why this priority?

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

Package Ubuntu Release Status
curl 26.04 LTS resolute
Fixed 8.18.0-1ubuntu2.8
24.04 LTS noble
Vulnerable
22.04 LTS jammy
Vulnerable
20.04 LTS focal
Vulnerable
18.04 LTS bionic
Vulnerable
16.04 LTS xenial
Vulnerable
14.04 LTS trusty
Vulnerable

Patch details

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

Package Patch details
curl

References

Related Ubuntu Security Notices (USN)

Other references

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