How severe is CVE-2026-11789?

CVE-2026-11789 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-11789 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-11789?

CVE-2026-11789 primarily affects Redhat Directory Server. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-11789?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-11789 have an EU (EUVD) identifier?

Yes. CVE-2026-11789 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35421.

When was CVE-2026-11789 published?

CVE-2026-11789 was published on 2026-06-09 and last updated on 2026-06-30.

CVE-2026-11789

CVE-2026-11789 is a medium-severity vulnerability in Redhat Directory Server with a CVSS 3.x base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-191.

Key facts

Severity: Medium (CVSS 3.x base score 4.9)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-35421
Weakness: CWE-191
Affected product: Redhat Directory Server
Published: 2026-06-09
Last modified: 2026-06-30

Description

A flaw was found in 389 Directory Server. The SMD5 password storage plugin performs unsigned integer underflow when computing salt length from a crafted password hash shorter than 16 bytes, causing a buffer over-read that crashes the LDAP server during authentication.

Frequently asked questions

What is CVE-2026-11789?: A flaw was found in 389 Directory Server. The SMD5 password storage plugin performs unsigned integer underflow when computing salt length from a crafted password hash shorter than 16 bytes, causing a buffer over-read that crashes the LDAP server during authentication.
How severe is CVE-2026-11789?: CVE-2026-11789 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-11789 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-11789?: CVE-2026-11789 primarily affects Redhat Directory Server. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-11789?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-11789 have an EU (EUVD) identifier?: Yes. CVE-2026-11789 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35421.
When was CVE-2026-11789 published?: CVE-2026-11789 was published on 2026-06-09 and last updated on 2026-06-30.

References

EU advisories (EUVD)

https://redhat.atlassian.net/browse/PSIRTSUPT-7600

Affected products (8)

cpe:2.3:a:redhat:directory_server:11.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:directory_server:12.0:*:*:*:*:*:*:*
cpe:2.3:a:redhat:directory_server:13.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:389_directory_server:-:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:10.0:*:*:*:*:*:*:*

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