A malicious peer (or a MITM) can send a small BER-encoded response causing a large memory allocation before any data is received. This can lead to an OutOfMemoryError and denial of service.
The client JVM OOMs (OutOfMemoryError bypasses the DecoderException handlers) or pins the large allocation per connection while the attacker stalls.
A handful of connections exhausts any heap. The same bytes from an unauthenticated pre-bind client hit any embedding server that did not set MAX_PDU_SIZE_ATTR.
This issue affects Apache Directory LDAP API: from 1.2.0 before 1.2.9.
Users are recommended to upgrade to version 1.2.9, which fixes the issue.
Analysis and contextual insights are available on OpenCVE Cloud.
No solution or workaround provided in the CVE record.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Mon, 05 Oct 2026 19:30:00 +0000
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ssvc
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Sat, 03 Oct 2026 00:30:00 +0000
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| Weaknesses | CWE-770 | |
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threat_severity
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cvssV3_1
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Fri, 02 Oct 2026 22:30:00 +0000
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Fri, 02 Oct 2026 10:45:00 +0000
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Apache
Apache directory Ldap Api |
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| Vendors & Products |
Apache
Apache directory Ldap Api |
Fri, 02 Oct 2026 09:30:00 +0000
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| Description | Memory allocation with excessive size value vulnerability in Apache Directory LDAP API. A malicious peer (or a MITM) can send a small BER-encoded response causing a large memory allocation before any data is received. This can lead to an OutOfMemoryError and denial of service. The client JVM OOMs (OutOfMemoryError bypasses the DecoderException handlers) or pins the large allocation per connection while the attacker stalls. A handful of connections exhausts any heap. The same bytes from an unauthenticated pre-bind client hit any embedding server that did not set MAX_PDU_SIZE_ATTR. This issue affects Apache Directory LDAP API: from 1.2.0 before 1.2.9. Users are recommended to upgrade to version 1.2.9, which fixes the issue. | |
| Title | Apache Directory LDAP API: Denial of service via excessive memory allocation in BER decode | |
| Weaknesses | CWE-789 | |
| References |
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Status: PUBLISHED
Assigner: apache
Published:
Updated: 2026-10-05T18:10:33.132Z
Reserved: 2026-09-29T16:17:56.332Z
Link: CVE-2026-102731
Updated: 2026-10-02T21:07:18.741Z
Status : Deferred
Published: 2026-10-02T10:17:04.530
Modified: 2026-10-05T19:17:12.740
Link: CVE-2026-102731
OpenCVE Enrichment
Updated: 2026-10-03T01:30:18Z