Local Authentication Flaw in SSSD's PAM Responder for Red Hat Products
CVE-2026-127100

5.5MEDIUM

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-2026-127100?

A vulnerability exists in SSSD's PAM responder that allows local attackers to exploit the JSON PAM extension. By submitting a crafted authentication request with a non-string OAuth2 code value, an attacker can cause a NULL pointer dereference. This results in the termination of the PAM responder, leading to potential interruptions in SSSD-backed authentication processes.

References

https://access.redhat.com/security/cve/CVE-2026-127100
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2572591
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Priyank Nigam (Microsoft Cloud Security) for reporting this issue.
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