CVE-2026-103878— Apache Directory LDAP API: Injection of plaintext responses during StartTLS
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 中存在敏感信息明文传输漏洞。 在发送搜索请求后启动 StartTLS 扩展操作，可能导致在 TLS 握手完成之前接收到以明文形式传输的数据。 此问题影响 Apache Directory LDAP API 2.1.0 至 2.1.8（不含 2.1.9）版本。 建议用户升级至 2.1.9 版本，该版本已修复此问题。
Possible ATT&CK Techniques 1 AI
T1042Affected 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-2026-103878
Vulnerability Information
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Vulnerability Title
Apache Directory LDAP API: Injection of plaintext responses during StartTLS
Source: CVE Program / CVE List V5
Vulnerability Description
Cleartext transmission of sensitive information vulnerability in Apache Directory LDAP API.
A StartTLS extended operation started after a Search request has been sent can lead to receive data in plain text before the TLS Handshake has been completed.
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
对数据真实性的验证不充分
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-2026-103878
| # | POC Description | Source Link | Shenlong Link |
|---|
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Mailing List Discussions for CVE-2026-103878 (1)
Same Patch Batch · Apache Software Foundation · 2026-10-02 · 69 CVEs total
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| CVE-2026-82458 | 8.7 HIGH | Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, |
| CVE-2026-96294 | 8.7 HIGH | Apache Thrift: nodejs web server: no `error` listener on an upgraded WebSocket connection |
| CVE-2026-86537 | 8.7 HIGH | Apache Thrift: A truncated HTTP request stops the D library's server, allowing an unauthen |
| 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 |
| CVE-2026-85494 | 8.7 HIGH | Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, |
| 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 |
| CVE-2026-93926 | 8.7 HIGH | Apache Thrift: C++ `THeaderTransport::untransform()` leaks the zlib stream on the error pa |
| 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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