CVE-2026-106026: tftp-hpa 5.4 before 6.0 Out-of-Bounds Read via tftpd Remap Jump Rule

Severity: low (CVSS 3.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-06 · updated 2026-10-06
Weakness: CWE-125

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 products

H. Peter Anvin tftp-hpa: from 5.4 before 6.0 — fixed in 6.0

How to fix

Upgrade to a fixed version: H. Peter Anvin tftp-hpa 6.0. Check the vendor advisory for mitigations.

References

https://git.kernel.org/pub/scm/network/tftp/tftp-hpa.git/
https://git.kernel.org/pub/scm/network/tftp/tftp-hpa.git/commit/?id=6735086fb6475c3e1f1daf9829836b3d06f14291
https://git.kernel.org/pub/scm/network/tftp/tftp-hpa.git/tree/tftpd/remap.c?h=tftp-hpa-5.4#n762
https://www.vulncheck.com/advisories/tftp-hpa-5.4-before-6.0-out-of-bounds-read-via-tftpd-remap-jump-rule

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