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.
References
| Link | Resource |
|---|---|
| https://github.com/PSeitz/lz4_flex/commit/055502ee5d297ecd6bf448ac91c055c7f6df9b6d | Patch |
| https://github.com/PSeitz/lz4_flex/security/advisories/GHSA-vvp9-7p8x-rfvv | Mitigation Vendor Advisory |
| https://rustsec.org/advisories/RUSTSEC-2026-0041.html | Third Party Advisory |
Configurations
Configuration 1 (hide)
|
History
30 Mar 2026, 15:05
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Pseitz
Pseitz lz4 Flex |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.5 |
| CPE | cpe:2.3:a:pseitz:lz4_flex:0.12.0:*:*:*:*:rust:*:* cpe:2.3:a:pseitz:lz4_flex:*:*:*:*:*:rust:*:* |
|
| References | () https://github.com/PSeitz/lz4_flex/commit/055502ee5d297ecd6bf448ac91c055c7f6df9b6d - Patch | |
| References | () https://github.com/PSeitz/lz4_flex/security/advisories/GHSA-vvp9-7p8x-rfvv - Mitigation, Vendor Advisory | |
| References | () https://rustsec.org/advisories/RUSTSEC-2026-0041.html - Third Party Advisory |
Information
Published : 2026-03-20 01:15
Updated : 2026-03-30 15:05
NVD link : CVE-2026-32829
Mitre link : CVE-2026-32829
CVE.ORG link : CVE-2026-32829
JSON object : View
Products Affected
pseitz
- lz4_flex