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  4. CVE 2026 103552 apache directory ldap api a unbound client can
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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-103552

Apache Directory LDAP API: A unbound client can send a deeply nested search filter that overflows the stack in the server's decoder

Answer in brief

CVE-2026-103552 records a Unknown severity vulnerability in Apache Directory LDAP API: A unbound client can send a deeply nested search filter that overflows the stack in the server's decoder. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/org.apache.directory.api:api-ldap-codec-core (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 2, 2026Updated Oct 2, 2026Source checked Oct 2, 2026First seen by HOL Oct 2, 2026Material review Oct 2, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/org.apache.directory.api:api-ldap-codec-core (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Apache Software Foundation/org.apache.directory.api:api-ldap-codec-coregeneric>=1.2.0 <1.2.91.2.9

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/org.apache.directory.api:api-ldap-codec-core.
  2. 2Review the reported fix. Update Apache Software Foundation/org.apache.directory.api:api-ldap-codec-core to 1.2.9 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 2, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 2, 2026

Sources and claim methodology

  • Source referencelists.apache.org
Upstream source description

Stack Overflow vulnerability in Apache Directory LDAP API. Before binding, a client can send a deeply nested search filter that overflows the stack in the server's decoder. 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • CISA ADP VulnrichmentAlso CWE-121
  • Apache Thrift: C++ `THeaderTransport::writeVarint32()` stack buffer overflow on a negative protocol idAlso CWE-121
  • Apache Directory LDAP API: Denial of service via excessive memory allocation in BER decodeSame generic ecosystem
  • Apache Directory LDAP API: Unsafe loading of Java code from LDAP schema elementsSame generic ecosystem
  • Apache Directory LDAP API: Injection of plaintext responses during StartTLSSame generic ecosystem
  • Apache Directory LDAP API: Denial of service via excessive bcrypt cost factor in stored passwordsSame generic ecosystem

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-121
Source
CVE List V5
Source checked
Oct 2, 2026
References
1 linked source
Open source record