Quick answers
- Is CVE-2026-104039 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-104039 being exploited in the wild.
- How severe is CVE-2026-104039?
- Medium severity, with a CVSS score of 4.7, published 6 October 2026.
- Which products and versions are affected?
- SSSD.
- Is there a fix for CVE-2026-104039?
- 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-2026-104039 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-104039?
- 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 use-after-free vulnerability (CWE-825) exists in the PAM responder when handling GSSAPI authentication. Cached connection state is freed without clearing the reference pointer, allowing an authenticated local attacker to trigger access to invalid memory by sending an additional request over the same connection. Exploitation requires GSSAPI to be explicitly configured in SSSD and results in denial of service via process crash.
Affected products
- SSSD
Timeline
- 2026-10-06: disclosed