OESA-2026-4658: tftp security update
TFTP which is the abbreviation of Trivial File Fransfer Protocol enables users to transfer files between local host and remote machine. This package tftp is a client implementing TFTP. Security Fix(es):
A flaw was found in tftp-hpa. When the in.tftpd remap engine processes an inverse remap rule that also aborts with a non-empty custom error message, it can pass invalid match offsets to the genmatchstring() function. This leads to out-of-bounds read/write operations. A remote, unauthenticated attacker can exploit this vulnerability by sending a specially crafted request, causing the daemon to crash and resulting in a denial of service.(CVE-2026-85234)
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
openeuler/tftpto a version that resolves this vulnerability.Fixed in 5.2-33.oe2203sp4
Event History
Frequently Asked Questions
What access does an attacker need to exploit this issue?
An attacker can exploit the issue remotely without authentication or privileges, and no user interaction is required.
Which systems are most directly exposed?
Systems running the tftp-hpa in.tftpd daemon are exposed when its remap engine processes an inverse remap rule that aborts with a non-empty custom error message. The daemon must be reachable by an attacker able to send crafted TFTP requests.
What is the expected security impact?
The documented impact is a daemon crash resulting in denial of service. The supplied vector indicates no confidentiality or integrity impact.