Vulnerability · Published Oct 6, 2026 · Assigned by VulnCheck
CVE-2026-106026tftp-hpa 5.4 before 6.0 Out-of-Bounds Read via tftpd Remap Jump Rule
Low 3.7
In plain English
A low-severity out-of-bounds read in tftp-hpa from H. Peter Anvin. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 31% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
tftp-hpa 5.4 before 6.0 contains an out-of-bounds read vulnerability in rewrite_string() in tftpd/remap.c that walks heap memory during jump label searches. Unauthenticated remote attackers can send read or write requests whose filename matches a remap jump rule to crash the forked in.tftpd request handler.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | tftp-hpa | no fix listed | DEBIAN-CVE-2026-106026 |
| Debian:13 | tftp-hpa | no fix listed | DEBIAN-CVE-2026-106026 |
| Debian:14 | tftp-hpa | 7.1-1 | DEBIAN-CVE-2026-106026 |
| Ubuntu:22.04:LTS | tftp-hpa | no fix listed | UBUNTU-CVE-2026-106026 |
| Ubuntu:24.04:LTS | tftp-hpa | no fix listed | UBUNTU-CVE-2026-106026 |
| Ubuntu:26.04:LTS | tftp-hpa | no fix listed | UBUNTU-CVE-2026-106026 |
| Ubuntu:26.10 | tftp-hpa | no fix listed | UBUNTU-CVE-2026-106026 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| H. Peter Anvin | tftp-hpa | 5.4 – before 6.0 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
References
- Patch Commit patch
- Vulnerable label search in rewrite_string() (tftp-hpa 5.4) technical-description
- https://git.kernel.org/pub/scm/network/tftp/tftp-hpa.git/ product
- VulnCheck Advisory: tftp-hpa 5.4 before 6.0 Out-of-Bounds Read via tftpd Remap Jump Rule third-party-advisory