# CVE-2026-78701: 389-ds-base: 389-ds-base: cve-2026-11610 incomplete fix may introduce a connection-stall dos

Status: published. Published: 2026-08-25. Updated: 2026-11-06.

A flaw was found in 389-ds-base. A remote, authenticated attacker could exploit a vulnerability in the Simple Authentication and Security Layer (SASL) UNBIND process. By sending a specially crafted request, the attacker can cause a connection to stall, leading to resource exhaustion and a Denial of Service (DoS) for the server.

## Remediation

- workaround: To mitigate this issue, restrict network access to the 389-ds-base service to only trusted clients and networks. This can be achieved by configuring firewall rules to limit inbound connections to the LDAP ports (typically 389 for LDAP and 636 for LDAPS) to known, authorized IP addresses or subnets.

Example using `firewalld`:
```bash
# firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<TRUSTED_IP_OR_SUBNET>" port port="389" protocol="tcp" accept'
# firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address="<TRUSTED_IP_OR_SUBNET>" port port="636" protocol="tcp" accept'
# firewall-cmd --reload
```
Replace `<TRUSTED_IP_OR_SUBNET>` with the actual IP addresses or network ranges of your trusted clients. This action may impact legitimate clients if not configured correctly. A service restart is not required for firewall changes to take effect. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (389-ds-base): ≥ 0:3.2.0-10.el10_2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (389-ds-base): ≥ 0:2.8.0-10.el9_8; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Directory Server 13.2 (dirsrv/dirsrv-container-rhel10): ≥ 1788851765; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Directory Server 11 (redhat-ds:11/389-ds-base): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Directory Server 12 (redhat-ds:12/389-ds-base): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Directory Server 13 (389-ds-base): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (389-ds-base): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (389-ds-base): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (389-ds:1.4/389-ds-base): 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: 0.78% as of 2026-11-05; percentile 56.02%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-787

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://access.redhat.com/errata/RHSA-2026:64784 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:64785 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/errata/RHSA-2026:65119 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-78701 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2523232 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-78701; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-78701; retrieved 2026-11-06; source updated Not reported

Revision: 49c985e1cbf5e36a848766ffc535017bff7a90d03aad3a303774657be4c2f3d4

Canonical: https://y2.dev/cve/CVE-2026-78701

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