CVE catalog

CVE-2026-102731

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 a

[CVE catalog]

Severity
High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.43% · Oct 27, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianapache-directory-apisid2.1.2-2vulnerable
Debianapache-directory-apiforky2.1.2-2vulnerable
Debianapache-directory-apitrixie2.1.2-2vulnerable
Debianapache-directory-apibookworm2.1.2-1vulnerable

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianapache-directory-apisourcesid(unfixed)not yet assignedNot reported[1149877]
Debianapache-directory-apisourceforky(unfixed)not yet assignedNot reported[1149877]
Debianapache-directory-apisourcetrixie(unfixed)not yet assignedNot reported[1149877]
Debianapache-directory-apisourcebookworm(unfixed)not yet assignedNot reported[1149877]

[Debian bug #1149877]

Notes

[trixie] apache-directory-api: Minor issue [bookworm] apache-directory-api: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [libapache-directory-api-java]Affected

    Source package: [apache-directory-api]

    Details (2)

    • 2.1.2-1 · all · bookworm

      Affected

      nvd · apache-directory-api · debian · bookworm; nvd · apache-directory-api · debian · 12

    • 2.1.2-1 · all · bookworm

      Affected

      nvd · apache-directory-api · debian · bookworm; nvd · apache-directory-api · debian · 12

[Debian 13 (Trixie)]

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]