CVE-2026-103880— Apache Directory LDAP API: Denial of service via excessive bcrypt cost factor in stored passwords
Quick assessment
Affected
Apache Software Foundation Apache Directory LDAP API
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Apache Directory LDAP API 中存在非对称资源消耗漏洞。 在支持 bcrypt 算法的 LDAP 服务器中，使用较高的计算复杂度（例如强度值为 30）存储密码，会导致服务器在验证凭据时 CPU 长时间运行，可能持续数小时。为避免由此引发的服务器拒绝服务（DoS）风险，应强制实施对 bcrypt 计算成本的合理上限。 该漏洞影响 Apache Directory LDAP API 2.1.0 至 2.1.9（不含 2.1.9）版本。 建议用户升级至已修复此问题的版本 2.1.9。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Apache Software Foundation | Apache Directory LDAP API | 2.1.0< 2.1.9 |
affected |
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I. Basic Information for CVE-2026-103880
Vulnerability Information
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Vulnerability Title
Apache Directory LDAP API: Denial of service via excessive bcrypt cost factor in stored passwords
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不对称的资源消耗(放大攻击)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache Directory LDAP API | 2.1.0 ~ 2.1.9 | - |
|
II. Public POCs for CVE-2026-103880
| # | POC Description | Source Link | Shenlong Link |
|---|
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Mailing List Discussions for CVE-2026-103880 (1)
Same Patch Batch · Apache Software Foundation · 2026-10-02 · 69 CVEs total
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| CVE-2026-94642 | 8.7 HIGH | Apache Thrift: PHP `TSimpleServer` exits the whole process on any non-transport exception |
| CVE-2026-85493 | 8.7 HIGH | Apache Thrift, Apache Thrift: TProtocolUtil.skip follows peer-chosen nesting to any depth |
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| CVE-2026-91137 | 8.7 HIGH | Apache Thrift: PHP `thrift_protocol` accelerator: zero-byte container elements |
| CVE-2026-93925 | 8.7 HIGH | Apache Thrift: C++ `THeaderTransport::writeVarint32()` stack buffer overflow on a negative |
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| CVE-2026-94633 | 8.7 HIGH | Apache Thrift: Dart `TBinaryProtocol.readMessageBegin` allocates from the pre-versioned na |
| CVE-2026-94635 | 8.7 HIGH | Apache Thrift: Lua `TBinaryProtocol:readMessageBegin` bypasses `checkStringSize` on the pr |
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V. Comments for CVE-2026-103880
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