# CVE-2026-73199: Ipa: freeipa: null pointer dereference in `ipa-enrollment` extended operation (`join_oid`) via missing request value

Status: published. Published: 2026-08-20. Updated: 2026-11-05.

A flaw was found in the `ipa-enrollment` SLAPI plugin. A remote authenticated client can exploit a null pointer dereference vulnerability by sending a malformed Lightweight Directory Access Protocol (LDAP) extended operation. By omitting the request value for the `JOIN_OID` in the `ipa-enrollment` extended operation, an attacker can trigger a server crash, potentially causing a denial of service.

## Remediation

- workaround: Restrict network access to the LDAP service to trusted clients only. This can be achieved by configuring firewall rules to allow connections only from known, trusted IP addresses or subnets, thereby limiting the ability of authenticated attackers to send malformed extended operations. If host enrollment functionality is not required, disabling the `ipa-enrollment` SLAPI plugin can remove this attack surface. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (ipa): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (ipa): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (ipa): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (ipa): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (ipa): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat

- CISA KEV: No listing in collected sources

- EPSS: 0.35% as of 2026-11-05; percentile 29.21%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-476

## Exploit evidence

- exploit: https://bugzilla.redhat.com/show_bug.cgi?id=2471741 (ADP: CISA-ADP)

## References

- https://access.redhat.com/security/cve/CVE-2026-73199 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2471741 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2471741 (ADP: CISA-ADP; exploit)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-73199; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-73199; retrieved 2026-11-05; source updated Not reported

Revision: a5a5b16706fe9db41aead3f3c5504688562a867f2daa8225af1913b879386275

Canonical: https://y2.dev/cve/CVE-2026-73199

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