---
id: CVE-2026-85234
title: A flaw was found in tftp-hpa
summary: >-
  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 ou…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-125
vendor: Red Hat
product: tftp
affected:
  - tftp (all versions)
  - tftp
  - tftp (all versions)
  - tftp (all versions)
  - tftp (all versions)
  - erlang27
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T19:42:43.623'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85234'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-85234'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2460997'
    label: secalert@redhat.com
  - url: >-
      https://git.kernel.org/pub/scm/network/tftp/tftp-hpa.git/commit/?id=4b493532f5ce052a1c124acd0661233ec7918327
    label: secalert@redhat.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-85234.json
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-85234'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85234'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-15T19:07:11.649679Z'
ingestedAt: '2026-09-15T18:41:59.147Z'
epss: 0.00784
epssPercentile: 0.54256
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-85234.json)