Quick answers
- Is CVE-2026-104038 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-104038 being exploited in the wild.
- How severe is CVE-2026-104038?
- Medium severity, with a CVSS score of 5.9, published 6 October 2026.
- Which products and versions are affected?
- sssd sssd.
- Is there a fix for CVE-2026-104038?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-104038 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-104038?
- Check whether you run Sssd. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A null pointer dereference (CWE-476) occurs in sssd when processing certificates configured with LDAPU1 SID-based mapping rules. The service fails to verify the presence of the Microsoft SID extension before dereferencing it, causing the process to crash during certificate-driven authentication or lookup operations. Attack requires network access and an uncommon, non-default certificate mapping configuration.
Affected products
- sssd sssd
Timeline
- 2026-10-06: disclosed