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CVE-2026-106452— yawkat LZ4 Java: LZ4BlockInputStream allocates an unvalidated compressed length from the stream header

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 公司的 LZ4 Java 库为 Java 应用程序提供 LZ4 压缩功能。在版本 1.11.2 之前， 类中的 方法会验证传统 LZ4Block 头部中 字段为非负数，但在读取有效载荷数据之前，该方法会根据攻击者可控制的该值分配一个压缩输入缓冲区。这使得仅包含头部的流可以请求接近 2 GiB 的内存分配，从而导致 JVM 堆内存耗尽。 尽管标准（规范）LZ4 写入器在压缩后的数据不比原始块更小时会直接输出原始块，但存在漏洞的读取器却接受非规范（非标准）的 oversized（ oversized 指超

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
yawkat lz4-java < 1.11.2 affected
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I. Basic Information for CVE-2026-106452

Vulnerability Information
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Vulnerability Title
yawkat LZ4 Java: LZ4BlockInputStream allocates an unvalidated compressed length from the stream header
Source: CVE Program / CVE List V5
Vulnerability Description
yawkat LZ4 Java provides LZ4 compression for Java. Prior to 1.11.2, net.jpountz.lz4.LZ4BlockInputStream refill() validates that the compressedLen field in a legacy LZ4Block header is nonnegative but allocates a compressed-input buffer of that attacker-controlled size before reading payload data, allowing a header-only stream to request a near-2 GiB allocation and exhaust the JVM heap. Canonical writers emit raw blocks when compression is not smaller than the original block, but vulnerable readers accept non-canonical oversized compressed blocks. This issue is fixed in version 1.11.2.
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
未经控制的内存分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
yawkat lz4-java < 1.11.2 -

II. Public POCs for CVE-2026-106452

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III. Intelligence Information for CVE-2026-106452

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Other References for CVE-2026-106452 (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-2026-106450 5.3 MEDIUM yawkat LZ4 Java: LZ4FrameInputStream reallocates block buffers for every frame, allowing C
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-789

V. Comments for CVE-2026-106452

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