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CVE-2026-32829— lz4_flex: Decompression can leak information from uninitialized memory or reused output buffer

CVSS 8.2 · High EPSS 0.61% · P46

Possible ATT&CK Techniques 1AI

T1567 · Exfiltration Over Web Service

Affected Version Matrix 2

VendorProductVersion RangeStatus
PSeitzlz4_flex< 0.11.6affected
>= 0.12.0, < 0.12.1affected
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I. Basic Information for CVE-2026-32829

Vulnerability Information
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Vulnerability Title
lz4_flex: Decompression can leak information from uninitialized memory or reused output buffer
Source: CVE Program / CVE List V5
Vulnerability Description
lz4_flex is a pure Rust implementation of LZ4 compression/decompression. In versions 0.11.5 and below, and 0.12.0, decompressing invalid LZ4 data can leak sensitive information from uninitialized memory or from previous decompression operations. The library fails to properly validate offset values during LZ4 "match copy operations," allowing out-of-bounds reads from the output buffer. The block-based API functions (`decompress_into`, `decompress_into_with_dict`, and others when `safe-decode` is disabled) are affected, while all frame APIs are unaffected. The impact is potential exposure of sensitive data and secrets through crafted or malformed LZ4 input. This issue has been fixed in versions 0.11.6 and 0.12.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
lz4_flex 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
lz4_flex是PSeitz个人开发者的一个Rust语言的高性能LZ4压缩库。 lz4_flex 0.11.5及之前版本和0.12.0版本存在安全漏洞，该漏洞源于解压无效LZ4数据时存在越界读取，可能导致敏感信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
PSeitzlz4_flex < 0.11.6 -

II. Public POCs for CVE-2026-32829

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 11102 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-32829

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Patches & Fixes for CVE-2026-32829 (1)

Vendor Advisories for CVE-2026-32829 (2)

IV. Related Vulnerabilities

Same weakness: CWE-201

V. Comments for CVE-2026-32829

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