CVE-2026-68743: fedoraproject sssd Out-of-bounds Read

Vulnerability summary

CVE-2026-68743 is a high (CVSS 7.1) Out-of-bounds Read vulnerability in fedoraproject sssd. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.5% of scored vulnerabilities.

Timeline

1. 04-08-2026
   PublishedVulnerability first disclosed.
2. 31-08-2026
   Last modifiedVulnerability information updated.

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.

• CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.