OESA-2026-4853: 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.oe2403sp4
Event History
Frequently Asked Questions
Which systems are exposed to this issue?
Systems running the tftp-hpa in.tftpd daemon are exposed if they use an inverse remap rule that aborts with a non-empty custom error message. The affected package is identified as openeuler/tftp.
What does an attacker need to exploit it?
An attacker can exploit the flaw remotely without authentication by sending a specially crafted TFTP request to the daemon. Successful exploitation causes the daemon to crash, resulting in denial of service.
Is confidentiality or integrity impact described?
The supplied severity vector indicates no confidentiality or integrity impact. The described impact is availability loss through a crash of the TFTP daemon.