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CVE-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

7.3 High

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
Low

Exploit likelihood

0.33%Up 0.1 points since Oct 2, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.3

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

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.

Record
CVE-2026-103552
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness
CWE-121
Updated
2026-11-02
EUVDEUVD-2026-91382 7.3

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.

Record
EUVD-2026-91382
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-mggr-349m-j697 7.3

Stack Overflow vulnerability in Apache Directory LDAP API. Before binding, a client can send a...

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.

Record
GHSA-mggr-349m-j697
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness
CWE-121
Updated
2026-11-02
NVD 7.3

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.

Record
CVE-2026-103552
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness
CWE-121
Updated
2026-11-02
OSVDEBIAN-CVE-2026-103552 7.3

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.

Record
DEBIAN-CVE-2026-103552
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2026-103552 7.3

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.

Record
UBUNTU-CVE-2026-103552
CVSS 3.1
7.3 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
apache-directory-api
Debian:12
 All versions, plus listed versions
2.1.2-12.1.2-2
 None known
apache-directory-api
Debian:13
 All versions, plus listed versions
2.1.2-2
 None known
apache-directory-api
Debian:14
 All versions, plus listed versions
2.1.2-2
 None known
apache-directory-api
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.0.0~M20-3
 None known
apache-directory-api
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.0.0~M20-51.0.0-1
 None known
apache-directory-api
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.0.0-1
 None known
apache-directory-api
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.0.0-2
 None known
apache-directory-api
Ubuntu:24.04:LTS
 All versions, plus listed versions
2.1.2-1
 None known
apache-directory-api
Ubuntu:26.10
 All versions, plus listed versions
2.1.2-2build1
 None known
apache-directory-api
Ubuntu:26.04:LTS
 All versions, plus listed versions
2.1.2-22.1.2-2build1
 None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-103552 is a high vulnerability (CVSS 7.3) in Apache Software Foundation Directory Ldap Api, published October 2, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.33%, the 25th percentile. No source names a fixed version.

References

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