Buffer Overflow Vulnerability in FreeRADIUS EAP-FAST Module
CVE-2026-127030

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
12 November 2026

What is CVE-2026-127030?

A vulnerability exists in the FreeRADIUS EAP-FAST module due to improper length validation that can lead to a stack-based buffer overflow during session ticket processing. This flaw can be exploited by a remote, unauthenticated attacker who sends a specially crafted handshake request, causing the server to crash and resulting in a Denial of Service (DoS) condition. It is crucial for users and administrators to apply the latest patches to mitigate this issue.

References

https://access.redhat.com/security/cve/CVE-2026-127030
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2572340
issue-trackingx_refsource_REDHAT
https://github.com/FreeRADIUS/freeradius-server/commit/06...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank s4cr00t (Alipay Security Team) for reporting this issue. Upstream acknowledges Ada Logics and TristanInSec@gmail.com as the original reporters.
.