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Vulnerability · Published Oct 6, 2026 · Assigned by redhat

CVE-2026-104043Sssd: sssd: denial of service via undersized packet parsing in nss responder

Medium 5.5

In plain English

A medium-severity out-of-bounds read in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).

Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)<0.1%top 99.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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).

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12sssdno fix listedDEBIAN-CVE-2026-104043
Debian:13sssdno fix listedDEBIAN-CVE-2026-104043
Ubuntu:22.04:LTSsssdno fix listedUBUNTU-CVE-2026-104043
Ubuntu:24.04:LTSsssdno fix listedUBUNTU-CVE-2026-104043
Ubuntu:26.04:LTSsssdno fix listedUBUNTU-CVE-2026-104043
Ubuntu:26.10sssdno fix listedUBUNTU-CVE-2026-104043

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 6 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 9 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 4 see references
Red Hat Red Hat OpenShift Container Platform 5 see references

Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References