CVE-2026-32829 (GCVE-0-2026-32829)
Vulnerability from cvelistv5 – Published: 2026-03-20 00:49 – Updated: 2026-09-17 12:04
VLAI
EPSS
VEX
Title
lz4_flex: Decompression can leak information from uninitialized memory or reused output buffer
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-21 03:02 UTC
CWE
Assigner
GitHub_M
CNA
References
10 references
| URL | Tags |
|---|---|
| https://github.com/PSeitz/lz4_flex/security/advis… | x_refsource_CONFIRM |
| https://github.com/PSeitz/lz4_flex/commit/055502e… | x_refsource_MISC |
| https://rustsec.org/advisories/RUSTSEC-2026-0041.html | x_refsource_MISC |
| https://access.redhat.com/security/cve/CVE-2026-32829 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2448271 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:22862 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:16354 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:11800 | vendor-advisoryx_refsource_REDHAT |
| https://access.redhat.com/errata/RHSA-2026:19712 | vendor-advisoryx_refsource_REDHAT |
Impacted products
10 products
| Vendor | Product | Version | |
|---|---|---|---|
| PSeitz | lz4_flex |
Affected:
< 0.11.6
Affected: >= 0.12.0, < 0.12.1 |
|
| Red Hat | Logging Subsystem for Red Hat OpenShift 6.2 |
Unaffected:
1776894389 , < *
(rpm)
cpe:/a:redhat:logging:6.2::el9 |
|
| Red Hat | Logging Subsystem for Red Hat OpenShift 6.4 |
Unaffected:
1780052069 , < *
(rpm)
cpe:/a:redhat:logging:6.4::el9 |
|
| Red Hat | Logging Subsystem for Red Hat OpenShift 6.5 |
Unaffected:
1777574710 , < *
(rpm)
cpe:/a:redhat:logging:6.5::el9 |
|
| Red Hat | Red Hat OpenShift AI 3.3 |
Unaffected:
1778263962 , < *
(rpm)
cpe:/a:redhat:openshift_ai:3.3::el9 |
|
| Red Hat | OpenShift Lightspeed |
cpe:/a:redhat:openshift_lightspeed
|
|
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2
|
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai
|
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"value": "RHSA-2026:19712: Red Hat OpenShift AI 3.3"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-03-16T22:05:38.553Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-03-16T20:48:08.000Z",
"value": "Made public."
}
],
"title": "lz4_flex: lz4_flex\u0027s decompression can leak information from uninitialized memory or reused output buffer",
"x_adpType": "supplier",
"x_generator": {
"engine": "sadp-cli 1.0.0"
}
},
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-32829",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-03-21T03:02:22.812939Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-03-21T03:03:04.108Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "lz4_flex",
"vendor": "PSeitz",
"versions": [
{
"status": "affected",
"version": "\u003c 0.11.6"
},
{
"status": "affected",
"version": "\u003e= 0.12.0, \u003c 0.12.1"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "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."
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "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",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "HIGH",
"vulnIntegrityImpact": "NONE"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-201",
"description": "CWE-201: Insertion of Sensitive Information Into Sent Data",
"lang": "en",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"cweId": "CWE-823",
"description": "CWE-823: Use of Out-of-range Pointer Offset",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-03-20T00:49:12.893Z",
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M"
},
"references": [
{
"name": "https://github.com/PSeitz/lz4_flex/security/advisories/GHSA-vvp9-7p8x-rfvv",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/PSeitz/lz4_flex/security/advisories/GHSA-vvp9-7p8x-rfvv"
},
{
"name": "https://github.com/PSeitz/lz4_flex/commit/055502ee5d297ecd6bf448ac91c055c7f6df9b6d",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/PSeitz/lz4_flex/commit/055502ee5d297ecd6bf448ac91c055c7f6df9b6d"
},
{
"name": "https://rustsec.org/advisories/RUSTSEC-2026-0041.html",
"tags": [
"x_refsource_MISC"
],
"url": "https://rustsec.org/advisories/RUSTSEC-2026-0041.html"
}
],
"source": {
"advisory": "GHSA-vvp9-7p8x-rfvv",
"discovery": "UNKNOWN"
},
"title": "lz4_flex: Decompression can leak information from uninitialized memory or reused output buffer"
}
},
"cveMetadata": {
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"cveId": "CVE-2026-32829",
"datePublished": "2026-03-20T00:49:12.893Z",
"dateReserved": "2026-03-16T17:35:36.698Z",
"dateUpdated": "2026-09-04T12:04:42.204Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.