Partial Comparison Affecting sssd package, versions <0:2.12.0-3.el10_2.2


Severity

Recommended
medium

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.33% (24th percentile)

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  • Snyk IDSNYK-RHEL10-SSSD-20664192
  • published9 Oct 2026
  • disclosed9 Sept 2026

Introduced: 9 Sep 2026

CVE-2026-87853  (opens in a new tab)
CWE-187  (opens in a new tab)

How to fix?

Upgrade RHEL:10 sssd to version 0:2.12.0-3.el10_2.2 or higher.
This issue was patched in RHSA-2026:77534.

NVD Description

Note: Versions mentioned in the description apply only to the upstream sssd package and not the sssd package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

A flaw was found in SSSD's IdP authentication provider. The eval_access_token_buf() function compares the OIDC subject identifier using strncmp() with the authenticated user's identifier length, performing a prefix comparison instead of an exact match. An attacker whose IdP identifier is a strict prefix of a target user's identifier can authenticate as the target user.

CVSS Base Scores

version 3.1