Is CVE-2026-90994 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-90994 being exploited in the wild.

How severe is CVE-2026-90994?

Medium severity, with a CVSS score of 4, published 14 September 2026.

Is there a fix for CVE-2026-90994?

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.

Am I affected by CVE-2026-90994?

Check whether anything you run is named in the advisory. 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.

CVE-2026-90994: sssd PAM responder out-of-bounds read in pam_parse_in_data

CVE-2026-90994 · Severity: medium · CVSS 4 · Published 2026-09-14

SSSD is a critical authentication daemon that manages user accounts and authentication for Linux systems. A flaw in its PAM (Pluggable Authentication Modules) responder can be exploited by local users to crash the authentication service, temporarily preventing all login attempts and causing a denial of service across the system.

Quick answers

Is CVE-2026-90994 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-90994 being exploited in the wild.
How severe is CVE-2026-90994?: Medium severity, with a CVSS score of 4, published 14 September 2026.
Which products and versions are affected?: sssd sssd <UNKNOWN>.
Is there a fix for CVE-2026-90994?: 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-2026-90994 attacked?: It is in a hosted service.
Am I affected by CVE-2026-90994?: Check whether anything you run is named in the advisory. 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

The vulnerability is an out-of-bounds read (CWE-125) in the pam_parse_in_data() function of the PAM responder's protocol v1 parser. A local attacker with access to the PAM responder's UNIX socket can trigger the flaw by negotiating protocol v1 and sending an empty or truncated PAM request body. The out-of-bounds read can cause the PAM responder process to crash or restart, resulting in local denial of service. No user interaction or elevated privileges are required for exploitation. Patches are expected but may not be immediately available for all distributions.

Affected products

sssd sssd <UNKNOWN>

Timeline

2026-09-14: disclosed

References

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