Copyright © 2012 Red Hat, Inc. All rights reserved. Moderate 2026-08-03T07:36:56 sssd: sssd: NSS responder out-of-bounds read via unchecked addrlen in GETHOSTBYADDR 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CWE-125

A flaw was found in SSSD. The sss_nss_protocol_parse_addr() function in the NSS responder does not validate the addrlen field against the remaining packet body size. A local attacker can exploit this via a crafted GETHOSTBYADDR request to the NSS responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.

A flaw was found in SSSD. The sss_nss_protocol_parse_addr() function in the NSS responder does not validate the addrlen field against the remaining packet body size. A local attacker can exploit this via a crafted GETHOSTBYADDR request to the NSS responder socket, causing an out-of-bounds read and process crash, resulting in a denial of service.

This issue can only be triggered by a local attacker who can connect to the SSSD NSS responder unix socket and send crafted requests. The over-read bytes are used as a lookup key and are not returned to the client, so the impact is limited to denial of service. The sssd monitor may respawn the responder, but repeated crashes can lead to a persistent name-resolution outage for SSSD-managed users. Red Hat would like to thank Vivek Parikh (BreachX Zero Day Labs) for reporting this issue. Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability. Red Hat Enterprise Linux 10 Fix deferred sssd Red Hat Enterprise Linux 6 Not affected sssd Red Hat Enterprise Linux 7 Fix deferred sssd Red Hat Enterprise Linux 8 Fix deferred sssd Red Hat Enterprise Linux 9 Fix deferred sssd Red Hat OpenShift Container Platform 4 Fix deferred rhcos https://www.cve.org/CVERecord?id=CVE-2026-68742 https://nvd.nist.gov/vuln/detail/CVE-2026-68742