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No exploitation reportedFix available

CVE-2026-32829

No exploitation reported by the sources we read.

  • Published2026-03-20
  • Fixed in0.12.1 · 0.11.6
  • WeaknessCWE-201 · CWE-823

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-03-2001:15CVE publishedNVD

Versions per branch

OSV · NVD
Pseitz lz4 flex
BranchAffectedFixed in
0.12≥ 0.12.0, < 0.12.10.12.1
0.11< 0.11.60.11.6
0.x≥ 0.0.0-0, < 0.11.60.11.6
0.12= 0.12.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • PSeitz lz4_flex
    Affected
    • = < 0.11.6no fix stated
    • = >= 0.12.0, < 0.12.1no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-03-20

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • garage-1Chainguardall versions · fixed in 1.3.1-r3
  • garage-2Chainguardall versions · fixed in 2.2.0-r2
  • garage-2.2Chainguardall versions · fixed in 2.2.0-r3
  • parseableWolfiall versions · fixed in 2.6.1-r1
  • parseableChainguardall versions · fixed in 2.6.1-r1
  • py3.10-hf-xetWolfiall versions · fixed in 1.4.2-r1and 2 other packages
  • py3.10-hf-xetChainguardall versions · fixed in 1.4.2-r1and 2 other packages
  • qdrantWolfiall versions · fixed in 1.17.0-r5

9 more package ranges on OSV.dev

Vendor advisories

  • RHSA-2026:22862 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Logging for Red Hat OpenShift - 6.4.5

  • RHSA-2026:19712 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: RHOAI 3.3.3 - Red Hat OpenShift AI

  • RHSA-2026:11800 Red Hat Product Security4 products fixed

    Red Hat Security Advisory: Logging for Red Hat OpenShift - 6.2.10

Full record on NVD

Fix

  1. Update Pseitz lz4 flex to 0.12.1 · 0.11.6
  2. Vendor fix Red Hat Product Security RHSA-2026:22862 · 4 productsFor OpenShift Container Platform 4.20 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html/relea…
  3. Vendor fix Red Hat Product Security RHSA-2026:19712 · 2 productsFor Red Hat OpenShift AI 3.3.3 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/red_hat_openshift_ai/
  4. Vendor fix Red Hat Product Security RHSA-2026:11800 · 4 productsFor OpenShift Container Platform 4.18 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/relea…

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionnone2026-03-21
  • CNACVSS 4.08.2known since 2026-10-23
  • CNACVSS 3.17.5known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-201, CWE-823known since 2026-10-23
  • FIRST EPSSEPSS score0.6 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryHIGH2026-03-16

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 4.0 vector
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-03-20
Last Modified
2026-09-17
NVD status
Modified
GitHub Advisory
GHSA-vvp9-7p8x-rfvv

Frequently asked questions

What is CVE-2026-32829?

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.

Is CVE-2026-32829 actively exploited?

Active exploitation of CVE-2026-32829 has not been confirmed. Its EPSS score was 0.6% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-32829?

CVE-2026-32829 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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