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.

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-3416 advisory.

    A flaw was found in SSSD. A local attacker can exploit this vulnerability by sending a specially crafted     request to the autofs responder UNIX socket. Due to improper buffer offset calculation during request     parsing, the service performs an out-of-bounds memory read. This flaw can cause the autofs responder     process to crash, resulting in a denial of service (DoS). (CVE-2026-104029)

    A flaw was found in SSSD. In configurations where the autofs responder service is enabled, memory     allocated during successful request processing is not released until the client connection terminates. A     local attacker can exploit this vulnerability by maintaining an open connection and repeatedly submitting     valid requests, leading to memory exhaustion and a Denial of Service (DoS). (CVE-2026-104031)

    A flaw was found in SSSD. An unprivileged local user can repeatedly request master automount map updates     through the autofs responder due to missing authorization checks. This triggers global cache invalidation     and forces repeated lookups to backend directory providers, leading to a Denial of Service (DoS) from     degraded automount availability and elevated resource consumption. (CVE-2026-104032)

    A flaw was found in SSSD. When configured to enforce account expiration using LDAP (Lightweight Directory     Access Protocol) shadow attributes, SSSD fails to treat an expiration value of zero as an expired account.
    A user with valid credentials for an expired account can exploit this flaw to bypass access controls and     authenticate to the system. This allows unauthorized access to persist after the account was intended to     be deactivated. (CVE-2026-104033)

    A flaw was found in SSSD. A use-after-free vulnerability exists in the Kerberos Credential Manager (KCM)     responder during Kerberos ticket-granting ticket (TGT) renewal, where a deferred callback accesses memory     that has already been released. An authenticated local user with a renewable Kerberos ticket can trigger     this issue on systems configured with KCM renewal, causing the KCM responder service to crash and     resulting in a Denial of Service (DoS). (CVE-2026-104034)

    A flaw was found in SSSD. An issue in the Kerberos Credential Manager (KCM) responder allows a local user     to cause a Denial of Service (DoS) by maintaining a persistent connection and repeatedly storing and     destroying credentials. Because the service fails to release cached objects from memory when credentials     are removed, memory consumption grows continuously, ultimately exhausting available memory and rendering     the service unresponsive. (CVE-2026-104035)

    A flaw was found in SSSD's NFS idmap plugin. When retrieving cached user or group names, the plugin     detects if an entry exceeds the destination buffer size but fails to abort before copying data. A local     attacker can trigger this vulnerability by requesting identity lookups that resolve to oversized cached     entries, resulting in an out-of-bounds write. This flaw primarily leads to a Denial of Service (DoS) by     crashing the identity mapping service, and may also corrupt adjacent process memory. (CVE-2026-104036)

    A flaw was found in SSSD. A local attacker can exploit this issue by sending a specially crafted request     with an invalid packet length to the autofs responder UNIX socket. This causes an integer underflow and an     out-of-bounds memory read, which can crash the responder process and result in a denial of service (DoS).
    (CVE-2026-104037)

    A flaw was found in sssd. A remote attacker can cause a denial of service (DoS) by submitting a     certificate that lacks an expected Security Identifier (SID) extension. In deployments configured with     SID-based certificate mapping rules, the service fails to verify the presence of the extension before     processing it, causing the process to crash during authentication or lookup operations. (CVE-2026-104038)

    A flaw was found in SSSD. A local user can cause a denial of service (DoS) by disrupting system     authentication services. When handling Generic Security Services Application Programming Interface     (GSSAPI) authentication in the Pluggable Authentication Module (PAM) responder, cached connection state is     freed upon completion without clearing the reference pointer. An attacker can exploit this by sending an     additional request over the same connection, causing the service to access invalid memory and unexpectedly     terminate. (CVE-2026-104039)

    A flaw was found in sssd. A local attacker can cause a Denial of Service (DoS) by sending a crafted     Pluggable Authentication Module (PAM) request containing a zero-length authentication token to the     responder socket. Due to missing input validation, the service attempts to read beyond buffer boundaries     when processing the token, causing the PAM responder to crash. (CVE-2026-104042)

    A flaw was found in SSSD. A local attacker with access to the Name Service Switch (NSS) responder UNIX     socket can trigger an integer underflow by sending a specially crafted request with an undersized packet     header. This issue causes an out-of-bounds memory read during packet parsing, crashing the responder     process and resulting in a Denial of Service (DoS). (CVE-2026-104043)

    A flaw was found in SSSD. A local user can trigger a Denial of Service (DoS) by exploiting a race     condition in the autofs responder between asynchronous enumeration completion and map invalidation. By     repeatedly sending concurrent map enumeration and invalidation requests, an attacker can cause memory to     leak, leading to excessive memory consumption that can disrupt or crash the autofs service.
    (CVE-2026-104045)

    A flaw was found in SSSD. In trust-enabled identity management environments, SSSD evaluates Host-Based     Access Control (HBAC) rules by stripping domain qualifiers and comparing only short usernames. An     authenticated user in a trusted domain who shares the same username as an authorized local account can     bypass access policies and gain unauthorized access to protected services or hosts. (CVE-2026-104048)

    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. (CVE-2026-68742)

    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. (CVE-2026-68743)

    A flaw was found in SSSD. The sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates     reply space for all group entries but does not shrink the packet when groups are skipped, causing     uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose     cached directory data and heap layout information from the sssd_nss process. (CVE-2026-68744)

    A flaw was found in `sssd-kcm`. A local user or process able to connect to the `sssd-kcm` UNIX socket can     exploit this vulnerability. By sending a large request length header and then stalling the connection, an     attacker can cause the system to preallocate significant memory. This leads to memory exhaustion within     the `sssd-kcm` responder, resulting in a Denial of Service (DoS) for affected deployments.
    (CVE-2026-80048)

    A flaw was found in sssd. A local user can cause a Denial of Service (DoS) by exhausting the responder     service's available file descriptors (system handles used for open connections). By opening and     maintaining many concurrent connections to a responder socket while continuing to queue new connection     attempts, an attacker can trigger an unthrottled retry loop. This condition leads to high CPU utilization     and stalls the service, preventing legitimate identity and authentication requests from being processed.
    (CVE-2026-88252)

    A flaw was found in SSSD. When configured with the LDAP access provider and `ldap_access_order` including     `ppolicy` or `lockout`, a fail-open condition in the LDAP ppolicy access check can occur if a user lookup     returns zero results. This can incorrectly return success and cache an allow decision, permitting     continued authorization for a deleted or deprovisioned user. A remote attacker with prior valid account     context could exploit this to maintain access to information and potentially make limited modifications to     resources that should no longer be available. (CVE-2026-90462)

    A flaw was found in the sssd NSS responder. This input validation vulnerability allows a local attacker,     by sending specially crafted service lookup requests to the NSS responder's UNIX socket, to cause an out-     of-bounds read. This out-of-bounds read may lead to a denial of service (DoS) by crashing the NSS     responder process. While unprivileged local clients can typically reach the socket, there is no evidence     of privilege escalation or reliable data disclosure. (CVE-2026-90463)

    A flaw was found in sssd, specifically within the PAM (Pluggable Authentication Modules) responder's     protocol v1 parser, pam_parse_in_data(). A local client with access to the PAM responder's UNIX socket can     exploit this by negotiating protocol v1 and sending an empty or truncated PAM request body. This can     trigger an out-of-bounds read, potentially causing the PAM responder to terminate or restart, leading to a     local denial of service. (CVE-2026-90994)

    A flaw was found in SSSD (System Security Services Daemon). A local attacker with privileges to connect to     the PAM (Pluggable Authentication Modules) responder socket can send a specially crafted protocol request.
    If the `pam_app_services` configuration is enabled and the service item is omitted from the request, a     NULL pointer dereference can occur. This vulnerability leads to a denial of service, causing the PAM     responder to crash and disrupt authentication services. (CVE-2026-90995)

    A flaw was found in sssd. A local unprivileged user could send a specially crafted request with a zero-     length body to the Network Security Services (NSS) responder. This could lead to a denial-of-service     condition, causing the NSS responder to become unstable or terminate. This vulnerability affects the     availability of the system responder. (CVE-2026-90996)

    A flaw was found in SSSD. When configured to evaluate password expiration warnings before restrictive     access rules in LDAP (Lightweight Directory Access Protocol) environments, an expired-password warning     terminates rule evaluation early and treats the access request as successful. A remote authenticated user     with an expired password using an alternative authentication method, such as SSH public key     authentication, can exploit this flaw to bypass access control restrictions and gain unauthorized access     to protected systems. (CVE-2026-92821)

Tenable has extracted the preceding description block directly from the tested product security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

According to the versions of the sssd packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities :

    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.(CVE-2026-68742)

    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.(CVE-2026-68743)

    A flaw was found in SSSD. The sss_nss_protocol_fill_initgr() function in the NSS responder pre-allocates     reply space for all group entries but does not shrink the packet when groups are skipped, causing     uninitialized heap bytes to be transmitted to the client. A local attacker can exploit this to disclose     cached directory data and heap layout information from the sssd_nss process.(CVE-2026-68744)

    A flaw was found in SSSD's LDAP sudo provider. When the ldap_sudo_search_base option is not explicitly     configured, SSSD searches the entire LDAP directory tree for sudoRole objects. An authenticated attacker     with write access to any subtree can inject a sudoRole object granting root-level sudo privileges on all     SSSD-enrolled hosts.(CVE-2026-14474)

Tenable has extracted the preceding description block directly from the EulerOS sssd security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:5079-1 advisory.

    - CVE-2026-12610: cancelled or completed PAM request while the asynchronous child process is still running     can lead to a       use-after-free (bsc#1269807).
    - CVE-2026-68742: unvalidated address lengths in NSS responder packet parsing can cause a heap out-of-     bounds read       (bsc#1273922).
    - CVE-2026-68743: oversized length parameters in authentication requests can cause heap out-of-bounds     reads       (bsc#1273925).
    - CVE-2026-68744: unshrunk packet allocations during group resolution can allow uninitialized heap memory     disclosure       (bsc#1273924).
    - CVE-2026-90462: Fail-open in LDAP ppolicy access check allows continued authorization (bsc#1282584).
    - CVE-2026-90463: out-of-bounds read in the NSS service request parsers (bsc#1280360).
    - CVE-2026-90994: out-of-bounds read in PAM v1 parser (bsc#1280361).
    - CVE-2026-90995: NULL pointer dereference in PAM responder (bsc#1280362).
    - CVE-2026-90996: zero-length request body underflow in the NSS responder (bsc#1280363).
    - CVE-2026-92821: access control bypass due to premature LDAP access rule evaluation (bsc#1284326).
    - CVE-2026-104029: denial of service due to out-of-bounds read in autofs responder (bsc#1284314).
    - CVE-2026-104031: denial of service via memory exhaustion in autofs responder (bsc#1284316).
    - CVE-2026-104033: access control bypass due to improper LDAP shadow expiration check (bsc#1284318).
    - CVE-2026-104036: denial of service due to out-of-bounds write in NFS idmap plugin (bsc#1284321).
    - CVE-2026-104037: denial of service due to packet length underflow in autofs responder (bsc#1284322).
    - CVE-2026-104038: denial of service via missing SID extension in certificate mapping (bsc#1284323).
    - CVE-2026-104039: denial of service due to stale connection state reuse in PAM GSSAPI responder     (bsc#1284324).
    - CVE-2026-104043: Denial of Service via undersized packet parsing in NSS responder (bsc#1284266).
    - CVE-2026-104045: denial of service via race condition in autofs responder (bsc#1284470).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The AlmaLinux 9.6 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1787733592 advisory.

  - 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. (CVE-2026-68742)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Rocky Linux 9.6 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.6:CLSA-2026:1787733592 advisory.

  - 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. (CVE-2026-68742)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The AlmaLinux 9.2 host has packages installed that are affected by a vulnerability as referenced in the TuxCare ALMALINUX9.2:CLSA-2026:1788162583 advisory.

  - 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. (CVE-2026-68742)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21748-1 advisory.

    Security issues fixed:

    - CVE-2026-68742: insufficient validation in the NSS responder can lead to an out-of-bounds read and a     process crash       when a crafted GETHOSTBYADDR request is sent to the NSS responder socket (bsc#1273922).
    - CVE-2026-68743: insufficient validation in the PAM responder can lead to an out-of-bounds read and a     process crash       when a crafted protocol v1 request is processed (bsc#1273925).
    - CVE-2026-68744: improper memory management in the NSS responder can lead to uninitialized heap memory     disclosure       from the `sssd_nss` process (bsc#1273924).

    Other updates and bugfixes:

    - Add `systemd-tmpfiles` configuration file to populate `/var/lib/sss` with the correct permissions on     transactional       servers (bsc#1274748).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-68742)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
377933	Amazon Linux 2023 : libipa_hbac, libipa_hbac-devel, libsss_autofs (ALAS2023-2026-3416)	Nessus	Amazon Linux Local Security Checks	Local	high
376751	EulerOS 2.0 SP12 : sssd (EulerOS-SA-2026-4457)	Nessus	Huawei Local Security Checks	Local	high
376716	EulerOS 2.0 SP12 : sssd (EulerOS-SA-2026-4534)	Nessus	Huawei Local Security Checks	Local	high
376270	SUSE SLES15: libipa_hbac-devel / libipa_hbac0 / libsss_certmap-devel / etc (SUSE-SU-2026:5079-1)	Nessus	SuSE Local Security Checks	Local	high
361093	AlmaLinux 9.6 [TuxCare] Security Update: libipa_hbac / libipa_hbac-devel / libsss_autofs / libsss_certmap / etc (ALMALINUX9.6:CLSA-2026:1787733592)	Nessus	Alma Linux Local Security Checks	Local	medium
360934	Rocky Linux 9.6 [TuxCare] Security Update: libipa_hbac / libipa_hbac-devel / libsss_autofs / libsss_certmap / etc (ALMALINUX9.6:CLSA-2026:1787733592)	Nessus	Rocky Linux Local Security Checks	Local	medium
360925	AlmaLinux 9.2 [TuxCare] Security Update: libipa_hbac / libipa_hbac-devel / libsss_autofs / libsss_certmap / etc (ALMALINUX9.2:CLSA-2026:1788162583)	Nessus	Alma Linux Local Security Checks	Local	medium
343953	openSUSE 16: libipa_hbac-devel / libipa_hbac0 / libnfsidmap-sss / etc (openSUSE-SU-2026:21748-1)	Nessus	SuSE Local Security Checks	Local	high
331690	Linux Distros Unpatched Vulnerability : CVE-2026-68742	Nessus	Misc.	Local	medium

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