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CVE Record

CVE-2026-4424: Libarchive: libarchive: information disclosure via heap out-of-bounds read in rar archive processing

A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR archive, leading to the disclosure of sensitive heap memory information without requiring authentication or user interaction.

HighCVSS 7.5Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2026-4424 is an information-disclosure flaw in libarchive when handling crafted RAR archives. An attacker could cause vulnerable systems to read beyond heap memory bounds and expose sensitive process memory. The listed impact is confidentiality only, but the attack is remote, low-complexity, unauthenticated, and requires no user interaction.

Executive priority

Patch on an expedited basis for systems that handle untrusted archives, especially automated upload, scanning, email, support, or container workflows. The issue is not listed as actively exploited in the supplied evidence, but the remote, unauthenticated confidentiality impact justifies high priority.

Technical view

The flaw is a CWE-125 heap out-of-bounds read in libarchive RAR processing. The source attributes it to improper validation of the LZSS sliding window size after compression-method transitions. CVSS is 7.5 high, with network attack vector, low complexity, no privileges, no user interaction, and high confidentiality impact.

Likely exposure

Exposure is most likely on Red Hat systems using vulnerable libarchive packages, including listed RHEL 7 ELS, RHEL 8, RHEL 9, RHEL 10 streams, and RHCOS/OpenShift 4.12 and 4.13. Risk is higher where services automatically ingest or inspect untrusted RAR archives.

Exploitation context

The source bundle says exploitation is possible through a specially crafted RAR archive. It does not cite CISA KEV listing or active exploitation. Treat internet-facing or automated archive-processing workflows as more exposed, but do not assume exploitation in the wild from these sources alone.

Researcher notes

Evidence is limited to the CVE source bundle and Red Hat advisory references. The bundle names affected Red Hat package streams and RHCOS versions but does not provide exploit code, active exploitation evidence, or universal upstream fixed-version details. Validate exposure by package stream and archive-processing reachability.

Mitigation direction

  • Apply the relevant Red Hat security advisories for each affected platform stream.
  • Prioritize systems that process untrusted RAR archives automatically or remotely.
  • Temporarily restrict untrusted RAR ingestion where patching cannot happen quickly.
  • Check vendor guidance for non-Red Hat libarchive builds before assuming status.
  • Track OpenShift/RHCOS updates separately from standard host package updates.

Validation and detection

  • Inventory installed libarchive and RHCOS versions against the affected versions listed.
  • Confirm the applicable RHSA has been applied for each Red Hat stream.
  • Identify applications, scanners, and pipelines that process RAR archives.
  • Review whether archive ingestion accepts unauthenticated or external submissions.
  • Document systems where patch timing depends on OpenShift node image updates.
Prepared
Confidence
high
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-125: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-4424 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
2ADP providers
39Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: yesTechnical Impact: partial

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6redhat
7.5CVSS 3.1HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N3.93.6redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

7.5High
CVSS 3.1 vector shape for CVE-2026-4424Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. ADP timelineredhat-SADP

    Made public.

  2. Source timelineredhat

    Made public.

  3. ADP timelineredhat-SADP

    Reported to Red Hat.

  4. Source timelineredhat

    Reported to Red Hat.

  5. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  6. CVE publishedCVE Program

    The CVE record was published.

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPlibarchive: libarchive: Information disclosure via heap out-of-bounds read in RAR archive processing
other:Red Hat severity ratingcvssV3_1
  • 2026-03-19T12:22:21.740Z: Reported to Red Hat.
  • 2026-03-19T00:00:00.000Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat Enterprise Linux 10libarchive, 0:3.7.7-8.el10_1affected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Supportlibarchive, 0:3.7.7-5.el10_0affected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Supportlibarchive, 0:3.1.2-14.el7_9.2affected
Red HatRed Hat Enterprise Linux 8libarchive, 0:3.3.3-7.el8_10affected
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Supportlibarchive, 0:3.3.2-8.el8_2.2affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportlibarchive, 0:3.3.3-1.el8_4.2affected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onlibarchive, 0:3.3.3-1.el8_4.2affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportlibarchive, 0:3.3.3-6.el8_6.1affected
Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update Servicelibarchive, 0:3.3.3-6.el8_6.1affected
Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP Solutionslibarchive, 0:3.3.3-6.el8_6.1affected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Servicelibarchive, 0:3.3.3-5.el8_8.2affected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutionslibarchive, 0:3.3.3-5.el8_8.2affected
Red HatRed Hat Enterprise Linux 9libarchive, 0:3.5.3-9.el9_7affected
Red HatRed Hat Enterprise Linux 9libarchive, 0:3.5.3-9.el9_7affected
Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP Solutionslibarchive, 0:3.5.3-2.el9_0.4affected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutionslibarchive, 0:3.5.3-5.el9_2.2affected
Red HatRed Hat Enterprise Linux 9.4 Extended Update Supportlibarchive, 0:3.5.3-5.el9_4affected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Supportlibarchive, 0:3.5.3-7.el9_6.1affected
Red HatRed Hat OpenShift Container Platform 4.12rhcos, 412.86.202604281506-0affected
Red HatRed Hat OpenShift Container Platform 4.13rhcos, 413.92.202605271328-0affected
Red HatRed Hat OpenShift Container Platform 4.14rhcos, 414.92.202605060243-0affected
Red HatRed Hat OpenShift Container Platform 4.15rhcos, 415.92.202605060220-0affected
Red HatRed Hat OpenShift Container Platform 4.16rhcos, 416.94.202604211449-0affected
Red HatRed Hat OpenShift Container Platform 4.17rhcos, 417.94.202605112123-0affected
Red HatRed Hat OpenShift Container Platform 4.18rhcos, 418.94.202604240015-0affected
Red HatRed Hat OpenShift Container Platform 4.19rhcos, 4.19.9.6.202605201155-0affected
Red HatRHEL-8 based Middleware Containersrhpam-7/rhpam-businesscentral-monitoring-rhel8, 7.13.5-4.1777325677affected
Red HatRHEL-8 based Middleware Containersrhpam-7/rhpam-businesscentral-rhel8, 7.13.5-4.1777325711affected
Red HatRHEL-8 based Middleware Containersrhpam-7/rhpam-controller-rhel8, 7.13.5-4.1777325710affected
Red HatRHEL-8 based Middleware Containersrhpam-7/rhpam-dashbuilder-rhel8, 7.13.5-3.1777325680affected
Weakness

CWE details

CWE-125

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-125 · source CWE mapping

Out-of-bounds Read

Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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