CVE-2026-106026 tftp-hpa 5.4 before 6.0 Out-of-Bounds Read via tftpd Remap Jump Rule
Unauthenticated attackers can crash the TFTP server by sending requests matching remap jump rules, requiring specific remap configuration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-106026?
CVE-2026-106026 is a medium-severity memory corruption vulnerability in H. Peter Anvin tftp-hpa, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-125
Which versions are affected by CVE-2026-106026?
How do I fix CVE-2026-106026?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-106026 being exploited?
There is no known exploitation of CVE-2026-106026 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-106026, GHSA-w9pp-27r4-r6rj, UBUNTU-CVE-2026-106026.