Buffer Overflow Vulnerability in FreeRADIUS EAP-SIM Module
CVE-2026-127029

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-2026-127029?

A vulnerability exists in the FreeRADIUS Extensible Authentication Protocol Method for Subscriber Identity Module (EAP-SIM) module. This flaw arises when the server incorrectly handles the length of a client-supplied identity during the processing of authentication requests, leading to a stack buffer overflow. An unauthenticated remote attacker can exploit this vulnerability by sending crafted EAP-SIM messages, which may cause the server to crash and result in a Denial of Service (DoS) condition.

References

https://access.redhat.com/security/cve/CVE-2026-127029
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2572339
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 Glen Saunders as the original reporter.
.