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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-106450— yawkat LZ4 Java: LZ4FrameInputStream reallocates block buffers for every frame, allowing CPU and GC amplification from small inputs

Quick assessment

Affected
yawkat lz4-java
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.

yawkat LZ4 Java 为 Java 提供了 LZ4 压缩功能。在版本 1.11.4 之前，net.jpountz.lz4.LZ4FrameInputStream 类的 readHeader() 方法在读取最大块大小的帧头时，会分配两个新的 4 MiB 块缓冲区。默认启用的“连接帧”（concatenated-frame）模式允许攻击者构造包含大量极小空帧的数据流，从而每读取约 11 字节的输入数据即可触发约 8 MiB 的内存分配。由于该流在解压过程中不产生任何解压输出，但会持续消耗 CPU 和垃圾回收时

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
yawkat lz4-java < 1.11.4 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-106450

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
yawkat LZ4 Java: LZ4FrameInputStream reallocates block buffers for every frame, allowing CPU and GC amplification from small inputs
Source: CVE Program / CVE List V5
Vulnerability Description
yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.4, net.jpountz.lz4.LZ4FrameInputStream readHeader() allocates two new 4 MiB block buffers whenever a maximum-block-size frame header is read, and the default concatenated-frame mode allows attacker-controlled streams containing many minimal empty frames to trigger roughly 8 MiB of allocation for every 11 input bytes. The stream produces no decompressed output while consuming CPU and garbage-collection time, so decompressed-size limits do not mitigate the issue; readSingleFrame mode is not affected. This issue is fixed in version 1.11.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
yawkat lz4-java < 1.11.4 -

II. Public POCs for CVE-2026-106450

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

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-106450

请登录查看更多情报信息。

Other References for CVE-2026-106450 (3)

Same Patch Batch · yawkat · 2026-10-06 · 5 CVEs total

CVE-2026-106451 7.3 HIGH yawkat LZ4 Java: Native library extraction to a shared temporary directory is vulnerable t
CVE-2026-106452 5.3 MEDIUM yawkat LZ4 Java: LZ4BlockInputStream allocates an unvalidated compressed length from the s
CVE-2026-106453 5.3 MEDIUM yawkat LZ4 Java: LZ4DecompressorWithLength allocates the unvalidated size from the 4-byte
CVE-2026-106449 3.7 LOW yawkat LZ4 Java: LZ4BlockInputStream with stopOnEmptyBlock=false recurses once per empty b

IV. Related Vulnerabilities

Same product: lz4-java
Same vendor: yawkat
Same weakness: CWE-770

V. Comments for CVE-2026-106450

No comments yet

Leave a comment