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Vulnerability record · CVE-2026-68743 · published 4 August 2026

CVE-2026-68743: Fedoraproject sssd out-of-bounds read vulnerability

Fedoraproject · Sssd

A flaw was found in SSSD. The extract_authtok_v1() function in the PAM responder does not validate the auth_token_length field against the remaining buffer size before processing. A local attacker can exploit this via a crafted protocol v1 request to the PAM responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.

7.1 CVSS 3.1 High EPSS 0.13% · top 97.6% CWE-125 · Out-of-bounds read
7.1CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
2References
31 Aug 2026Last modified by NVD

Description

A flaw was found in SSSD. The extract_authtok_v1() function in the PAM responder does not validate the auth_token_length field against the remaining buffer size before processing. A local attacker can exploit this via a crafted protocol v1 request to the PAM responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/security/cve/CVE-2026-68743 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2509760 Issue TrackingVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-68743), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.