CVE-2026-85234
Fixed in a distro release EPSS <1%CVSS 7.5
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.
Products: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Hardened Images
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux 10 | tftp | 5.2-50.el10_2 |
| AlmaLinux 10 | tftp-server | 5.2-50.el10_2 |
| AlmaLinux 8 | tftp | 5.2-28.el8_10 |
| AlmaLinux 8 | tftp-server | 5.2-28.el8_10 |
| AlmaLinux 9 | tftp | 5.2-40.el9_8.1 |
| AlmaLinux 9 | tftp-server | 5.2-40.el9_8.1 |
| Debian 12 | tftp-hpa | no fix |
| Debian 13 | tftp-hpa | no fix |
| Debian 14 | tftp-hpa | 5.3+20251116-1 |
| Red Hat Enterprise Linux 10.2 | tftp | 0:5.2-50.el10_2 |
| Red Hat Enterprise Linux 10.2 | tftp-debuginfo | 0:5.2-50.el10_2 |
| Red Hat Enterprise Linux 10.2 | tftp-debugsource | 0:5.2-50.el10_2 |
| Red Hat Enterprise Linux 10.2 | tftp-server | 0:5.2-50.el10_2 |
| Red Hat Enterprise Linux 10.2 | tftp-server-debuginfo | 0:5.2-50.el10_2 |
| Red Hat Enterprise Linux 8 | tftp | 0:5.2-28.el8_10 |
| Red Hat Enterprise Linux 8 | tftp-debuginfo | 0:5.2-28.el8_10 |
| Red Hat Enterprise Linux 8 | tftp-debugsource | 0:5.2-28.el8_10 |
| Red Hat Enterprise Linux 8 | tftp-server | 0:5.2-28.el8_10 |
| Red Hat Enterprise Linux 8 | tftp-server-debuginfo | 0:5.2-28.el8_10 |
| Red Hat Enterprise Linux 9 | tftp | 0:5.2-40.el9_8.1 |
| Red Hat Enterprise Linux 9 | tftp-debuginfo | 0:5.2-40.el9_8.1 |
| Red Hat Enterprise Linux 9 | tftp-debugsource | 0:5.2-40.el9_8.1 |
| Red Hat Enterprise Linux 9 | tftp-server | 0:5.2-40.el9_8.1 |
| Red Hat Enterprise Linux 9 | tftp-server-debuginfo | 0:5.2-40.el9_8.1 |
| Rocky Linux 10 | tftp | 0:5.2-50.el10 |
| Rocky Linux 8 | tftp | 0:5.2-28.el8_10 |
| Rocky Linux 9 | tftp | 0:5.2-40.el9_8.1 |
| Ubuntu 14.04 LTS | tftp-hpa | no fix |
| Ubuntu 16.04 LTS | tftp-hpa | no fix |
| Ubuntu 18.04 LTS | tftp-hpa | no fix |
| Ubuntu 20.04 LTS | tftp-hpa | no fix |
| Ubuntu 22.04 LTS | tftp-hpa | no fix |
| Ubuntu 24.04 LTS | tftp-hpa | no fix |
| Ubuntu 26.04 LTS | tftp-hpa | no fix |
| Ubuntu 26.10 | tftp-hpa | no fix |