How severe is CVE-2026-11787?

CVE-2026-11787 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-11787 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-11787?

CVE-2026-11787 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-2026-11787?

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

Does CVE-2026-11787 have an EU (EUVD) identifier?

Yes. CVE-2026-11787 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35419.

When was CVE-2026-11787 published?

CVE-2026-11787 was published on 2026-06-09 and last updated on 2026-06-30.

CVE-2026-11787

CVE-2026-11787 is a medium-severity vulnerability in Redhat Directory Server with a CVSS 3.x base score of 5.0. 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-126.

Key facts

Severity: Medium (CVSS 3.x base score 5.0)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-35419
Weakness: CWE-126
Affected product: Redhat Directory Server
Published: 2026-06-09
Last modified: 2026-06-30

Description

A flaw was found in 389 Directory Server. The ldap_utf8prev() function reads bytes before the start of a buffer without bounds checking, causing a heap buffer over-read in string filter parsing that may influence internal filter processing behavior.

Frequently asked questions

What is CVE-2026-11787?: A flaw was found in 389 Directory Server. The ldap_utf8prev() function reads bytes before the start of a buffer without bounds checking, causing a heap buffer over-read in string filter parsing that may influence internal filter processing behavior.
How severe is CVE-2026-11787?: CVE-2026-11787 has a CVSS 3.x base score of 5.0, rated medium severity. It is exploitable over network with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-11787 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-11787?: CVE-2026-11787 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-2026-11787?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-11787 have an EU (EUVD) identifier?: Yes. CVE-2026-11787 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-35419.
When was CVE-2026-11787 published?: CVE-2026-11787 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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