CVE-2026-127030
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Improper Length Validation Leads to Stack Buffer Overflow in FreeRADIUS

Publication date: 2026-11-12

Last updated on: 2026-11-12

Assigner: redhat-SADP

Description
A flaw was found in freeradius. An improper length validation in the EAP-FAST module allows a stack-based buffer overflow during session ticket processing. A remote, unauthenticated attacker can exploit this flaw by sending a specially crafted handshake request, causing the server process to crash and resulting in a Denial of Service (DoS).

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Meta Information

Published
2026-11-12
Last Modified
2026-11-12
Generated
2026-11-12
AI Q&A
2026-11-12
EPSS Evaluated
N/A
NVD
CVE-2026-127030
EUVD
EUVD-2026-124536

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.

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Executive Summary

This vulnerability is a stack-based buffer overflow in FreeRADIUS's EAP-FAST module caused by improper length validation during session ticket processing. A remote attacker can send a specially crafted handshake request to crash the server, resulting in a Denial of Service (DoS). The flaw occurs before authentication, allowing exploitation without credentials.

Impact Analysis

The vulnerability can disrupt FreeRADIUS service availability, causing authentication failures for all users relying on the server. Systems with EAP-FAST enabled are at risk, while default configurations are unaffected. Exploitation requires no authentication, making it easier for attackers to target vulnerable systems.

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