CVE-2026-11884
CVE-2026-11884 is a medium-severity vulnerability with a CVSS 3.x base score of 6.5. 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-122.
Key facts
- Severity: Medium (CVSS 3.x base score 6.5)
- EPSS exploit prediction: 0% (27th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-36045
- Weakness: CWE-122
- Published:
- Last modified:
Description
A heap buffer overflow flaw was found in 389 Directory Server. When serializing objectclass definitions, the oc_superior (SUP) field length is omitted from buffer size calculations in read_schema_dse() and schema_oc_to_string(), but the field is still written via strcat(). An attacker with Directory Manager privileges, or a compromised replication supplier, can trigger a server crash by creating objectclasses with long SUP values. This is an incomplete fix variant of CVE-2025-14905.
Frequently asked questions
- What is CVE-2026-11884?
- A heap buffer overflow flaw was found in 389 Directory Server. When serializing objectclass definitions, the oc_superior (SUP) field length is omitted from buffer size calculations in read_schema_dse() and schema_oc_to_string(), but the field is still written via strcat(). An attacker with Directory Manager privileges, or a compromised replication supplier, can trigger a server crash by creating objectclasses with long SUP values. This is an incomplete fix variant of CVE-2025-14905.
- How severe is CVE-2026-11884?
- CVE-2026-11884 has a CVSS 3.x base score of 6.5, 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 high, and availability high.
- Is CVE-2026-11884 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-11884?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-11884 have an EU (EUVD) identifier?
- Yes. CVE-2026-11884 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36045.
- When was CVE-2026-11884 published?
- CVE-2026-11884 was published on 2026-06-10 and last updated on 2026-06-30.
References
- https://access.redhat.com/security/cve/CVE-2026-11884
- https://bugzilla.redhat.com/show_bug.cgi?id=2423624
- https://bugzilla.redhat.com/show_bug.cgi?id=2484913
EU advisories (EUVD)
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