Apache Directory LDAP API: Denial of service via excessive memory allocation in BER decode

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-102731
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-02 10:17:04 UTC
Updated2026-10-02 10:17:04 UTC
DescriptionMemory 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.

Risk And Classification

Problem Types: CWE-789 | CWE-789 CWE-789 Memory allocation with excessive size value

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Directory LDAP API affected 1.2.0 1.2.9 semver Not specified

References

ReferenceSourceLinkTags
lists.apache.org/thread.html/b8kg8881pc0v8lp59w0fcfrs69wjbqvd [email protected] lists.apache.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Claude Security (en)

CNA: The Apache Software Foundation (en)

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