Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-102731— Apache Directory LDAP API: Denial of service via excessive memory allocation in BER decode

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 中存在一个内存分配大小值过大漏洞。 恶意对等方（或中间人）可发送一个经过 BER 编码的小型响应，该响应在收到任何数据之前就会触发巨大的内存分配。这可能导致引发 OutOfMemoryError（内存溢出错误），从而造成拒绝服务（DoS）。 客户端 JVM 会出现 OutOfMemoryError（OutOfMemoryError 会绕过 DecoderException 异常处理机制），或者在攻击者故意延迟响应的情况下，为每个连接持续占用大量分配的内存。 少量连

AI Predicted 7.5 Difficulty: Easy EPSS 0.19% · P8
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-102731

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Apache Directory LDAP API: Denial of service via excessive memory allocation in BER decode
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Directory LDAP API 1.2.0 ~ 1.2.9 -

II. Public POCs for CVE-2026-102731

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-102731

请登录查看更多情报信息。

Mailing List Discussions for CVE-2026-102731 (1)

Same Patch Batch · Apache Software Foundation · 2026-10-02 · 69 CVEs total

CVE-2026-102795 9.3 CRITICAL Apache Traffic Server: SNI to Host header matching policy is not properly enforced
CVE-2026-91135 9.2 CRITICAL Apache Thrift: C++ `THeaderTransport::transform()` heap buffer overflow (write direction)
CVE-2026-83632 9.2 CRITICAL Apache Thrift: C++ THttpTransport grows its line buffer without bound
CVE-2026-61373 8.7 HIGH Apache Thrift: Java TSaslNonblockingServer pre-auth unbounded SASL frame allocation
CVE-2026-66859 8.7 HIGH Apache Thrift: c_glib multiplexed processor crashes on a message it cannot route
CVE-2026-94658 8.7 HIGH Apache Thrift: Lua `TFramedTransport`/`THttpTransport` re-slice the buffer on every read (
CVE-2026-94646 8.7 HIGH Apache Thrift: Node.js `server.js` ends the process on any per-connection error (+ two tri
CVE-2026-87117 8.7 HIGH Apache Thrift: PHP `thrift_protocol` accelerator dereferences a missing container-element
CVE-2026-86535 8.7 HIGH Apache Thrift: A JSON member name can stall the Node server's event loop indefinitely
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

Showing top 20 of 69 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Apache Directory LDAP API
Same vendor: Apache Software Foundation
Same weakness: CWE-789

V. Comments for CVE-2026-102731

No comments yet

Leave a comment