High 8.2Published Mar 19, 2026

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

Updated under an hour ago (Oct 27, 2026, 2:00 AM ET)

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It affects PSeitz lz4_flex and 5 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for PSeitz lz4_flex

Exploited in the last 30 days

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.

CVSS: 8.2 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-201, CWE-823
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Sep 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

PSeitz lz4_flex pseitz:lz4_flex (from the name)	before 0.11.6; from 0.12.0, < 0.12.1	CNA record
Red Hat Logging Subsystem for Red Hat OpenShift 6.2 redhat:logging	from 1776894389 not affected	CISA ADP
Red Hat Red Hat OpenShift AI 3.3 redhat:openshift_ai	from 1778263962 not affected	CISA ADP
Red Hat OpenShift Lightspeed redhat:openshift_lightspeed	All versions	CISA ADP
Red Hat Red Hat Ansible Automation Platform 2 redhat:ansible_automation_platform	2	CISA ADP
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CISA ADP
pseitz lz4_flex pseitz:lz4_flex	before 0.11.6; 0.12.0	NVD

References

References

https://github.com/PSeitz/lz4_flex/security/advisories/GHSA-vvp9-7p8x-rfvv	x-refsource-confirm, mitigation, vendor-advisory
https://github.com/PSeitz/lz4_flex/commit/055502ee5d297ecd6bf448ac91c055c7f6df9b6d	x-refsource-misc, patch
https://rustsec.org/advisories/RUSTSEC-2026-0041.html	x-refsource-misc, third-party-advisory
https://access.redhat.com/errata/RHSA-2026:11800
https://access.redhat.com/errata/RHSA-2026:16354
https://access.redhat.com/errata/RHSA-2026:19712
https://access.redhat.com/errata/RHSA-2026:22862
https://access.redhat.com/security/cve/CVE-2026-32829
https://bugzilla.redhat.com/show_bug.cgi?id=2448271
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32829.json

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.