EUVD-2026-79128
GHSA-rxqq-3mgh-v3m7
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (redhat) · only source for this CVE.
CVSS VectorVendor: redhat
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Denial of service in the tftp-hpa in.tftpd remap engine allows a remote, unauthenticated attacker to crash the TFTP daemon with a single crafted request: when an inverse remap rule also aborts with a non-empty custom error message, invalid regex match offsets are passed into genmatchstring(), producing out-of-bounds reads and writes. The flaw affects tftp-hpa as shipped in Red Hat Enterprise Linux 6 through 10 and Red Hat Hardened Images, but is only reachable when the daemon is launched with a remap (map-file) configuration containing such a rule, so default installations with no remap file do not exercise the vulnerable code path. …
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External POC / Exploit Code
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