No exploitation reported

CVE-2026-103880

Apache Directory LDAP API: Denial of service via excessive bcrypt cost factor in stored passwords

No exploitation reported by the sources we read.

Published2026-10-02
WeaknessCWE-405

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Asymmetric Resource Consumption vulnerability in Apache Directory LDAP API. Storing a password using the bcrypt algorithm with a high force like 30 in a LDAP server that supports this algorithm will cause the server CPU to run for hours checking the credentials. A bounded cost should be enforced to avoid a server DOS. This issue affects Apache Directory LDAP API: from 2.1.0 before 2.1.9. Users are recommended to upgrade to version 2.1.9, which fixes the issue.

Timeline

dates in UTC

2026-10-0210:17CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-103880?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-103880?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-103880 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionnone2026-10-05
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.17.52026-10-05
CNAweakness (CWE)CWE-405read 2026-10-23
FIRST EPSSEPSS score0.5 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2026-10-02
Last Modified: 2026-10-05
NVD status: Deferred

Frequently asked questions

What is CVE-2026-103880?

Is CVE-2026-103880 actively exploited?

Active exploitation of CVE-2026-103880 has not been confirmed. Its EPSS score was 0.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-103880?

CVE-2026-103880 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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