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Fencer Vulns
high 7.5

CVE-2026-4424 json

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

published 2026-03-19 7 mo ago modified 2026-11-04 4 d ago also EUVD-2026-13097

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 70%
public exploits
0
none known

Summary

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.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 0:3.7.7-8.el10_1
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:3.7.7-5.el10_0
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:3.1.2-14.el7_9.2
  • Red Hat Red Hat Enterprise Linux 8 0:3.3.3-7.el8_10
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support 0:3.3.2-8.el8_2.2
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:3.3.3-1.el8_4.2
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:3.3.3-1.el8_4.2
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:3.3.3-6.el8_6.1
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service 0:3.3.3-6.el8_6.1
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions 0:3.3.3-6.el8_6.1
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:3.3.3-5.el8_8.2
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:3.3.3-5.el8_8.2
  • Red Hat Red Hat Enterprise Linux 9 0:3.5.3-9.el9_7
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions 0:3.5.3-2.el9_0.4
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:3.5.3-5.el9_2.2
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support 0:3.5.3-5.el9_4
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:3.5.3-7.el9_6.1
  • Red Hat Red Hat OpenShift Container Platform 4.12 412.86.202604281506-0
  • Red Hat Red Hat OpenShift Container Platform 4.13 413.92.202605271328-0
  • Red Hat Red Hat OpenShift Container Platform 4.14 414.92.202605060243-0
  • Red Hat Red Hat OpenShift Container Platform 4.15 415.92.202605060220-0
  • Red Hat Red Hat OpenShift Container Platform 4.16 416.94.202604211449-0
  • Red Hat Red Hat OpenShift Container Platform 4.17 417.94.202605112123-0
  • Red Hat Red Hat OpenShift Container Platform 4.18 418.94.202604240015-0
  • Red Hat Red Hat OpenShift Container Platform 4.19 4.19.9.6.202605201155-0
  • Red Hat RHEL-8 based Middleware Containers 7.13.5-3.1777325680, 7.13.5-4.1777325677, 7.13.5-4.1777325680, 7.13.5-4.1777325708, 7.13.5-4.1777325709, 7.13.5-4.1777325710, 7.13.5-4.1777325711
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 1791371069, 1791371080, 1791788287, 1791970484
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 1789029076, 1791459707, 1791459711, 1791459759, 1791966259
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 1790598593
  • Red Hat Red Hat AI Inference Server 3.2 1779223651, 1779223654, 1780681984
  • libarchive Debian 12 3.6.2-1+deb12u4
  • libarchive Debian 13 3.7.4-4+deb13u1
  • libarchive Debian 14 3.8.7-1

debian advisories DEBIAN-CVE-2026-4424

  • libarchive Ubuntu 22.04 LTS 3.6.0-1ubuntu1.7
  • libarchive Ubuntu 24.04 LTS 3.7.2-2ubuntu0.7
  • libarchive Ubuntu 25.10 3.7.7-0ubuntu3.2
  • libarchive Ubuntu 26.04 LTS 3.8.5-1ubuntu2.1
  • libarchive Ubuntu Pro 14.04 LTS 3.1.2-7ubuntu2.8+esm5
  • libarchive Ubuntu Pro 16.04 LTS 3.1.2-11ubuntu0.16.04.8+esm3
  • libarchive Ubuntu Pro 18.04 LTS 3.2.2-3.1ubuntu0.7+esm3
  • libarchive Ubuntu Pro 20.04 LTS 3.4.0-2ubuntu1.5+esm2

ubuntu advisories UBUNTU-CVE-2026-4424

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libarchive hummingbird 1 3.8.7-1.hum1
  • libarchive RHEL 8 3.3.3-7.el8_10
  • bsdtar RHEL 8 3.3.3-7.el8_10
  • libarchive RHEL 9 3.5.3-9.el9_7
  • bsdtar RHEL 9 3.5.3-9.el9_7
  • libarchive RHEL 10.1 3.7.7-8.el10_1
  • bsdtar RHEL 10.1 3.7.7-8.el10_1
  • libarchive RHEL 8.4 EUS_LONG_LIFE, RHEL 8.4 AUS 3.3.3-1.el8_4.2

red hat advisories RHSA-2026:9592RHSA-2026:9026RHSA-2026:8944RHSA-2026:8908RHSA-2026:8873RHSA-2026:8866

  • libarchive SLES for SAP 15 SP5, SLES for SAP 15 SP4, SLES 15 SP5-LTSS +8 more 3.5.1-150400.3.24.1
  • libarchive SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 +1 more 3.7.2-150600.3.20.1
  • libarchive Linux Micro 6.1 3.7.4-slfo.1.1_4.1
  • libarchive Linux Micro 6.0 3.6.2-6.1
  • libarchive SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 3.3.3-32.17.1

suse advisories SUSE-SU-2026:2747-1SUSE-SU-2026:2599-1SUSE-SU-2026:2490-1SUSE-SU-2026:22248-1SUSE-SU-2026:22241-1

  • libarchive AlmaLinux 10 3.7.7-8.el10_1
  • bsdtar AlmaLinux 10 3.7.7-8.el10_1
  • libarchive AlmaLinux 9 3.5.3-9.el9_7
  • bsdtar AlmaLinux 9 3.5.3-9.el9_7
  • libarchive AlmaLinux 8 3.3.3-7.el8_10
  • bsdtar AlmaLinux 8 3.3.3-7.el8_10

almalinux advisories ALSA-2026:8492ALSA-2026:8510ALSA-2026:8534

  • libarchive Rocky Linux 9 3.5.3-9.el9_7
  • libarchive Rocky Linux 10 3.7.7-8.el10_1
  • libarchive Rocky Linux 8 3.3.3-7.el8_10

rocky linux advisories RLSA-2026:8510RLSA-2026:8492RLSA-2026:8534

  • libarchive Azure Linux 3.0 3.7.7-6

azure linux advisories AZL-80403

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-4424 updated cvss 7.5

libarchive: libarchive: Information disclosure via heap out-of-bounds read in RAR archive processing

  • Red Hat Enterprise Linux 6 libarchive
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 cert-manager/cert-manager-operator-rhel9 1791788287, cert-manager/jetstack-cert-manager-rhel9 1791371069, cert-manager/cert-manager-operator-bundle 1791970484, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791371080
    fixed: vendor fix RHSA-2026:82888
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18 cert-manager/cert-manager-operator-rhel9 1789029076, cert-manager/jetstack-cert-manager-rhel9 1791459711, cert-manager/cert-manager-istio-csr-rhel9 1791459759, cert-manager/cert-manager-operator-bundle 1791966259, cert-manager/jetstack-cert-manager-acmesolver-rhel9 1791459707
    fixed: vendor fix RHSA-2026:82354
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 cert-manager/cert-manager-trust-manager-rhel9 1790598593
    fixed: vendor fix RHSA-2026:72502
  • Red Hat Middleware Containers for OpenShift rhpam-7/rhpam-kieserver-rhel8 7.13.5-4.1777325709, rhpam-7/rhpam-controller-rhel8 7.13.5-4.1777325710, rhpam-7/rhpam-dashbuilder-rhel8 7.13.5-3.1777325680, rhpam-7/rhpam-smartrouter-rhel8 7.13.5-4.1777325708, rhpam-7/rhpam-businesscentral-rhel8 7.13.5-4.1777325711, rhpam-7/rhpam-process-migration-rhel8 7.13.5-4.1777325680, +1 more
    fixed: vendor fix RHSA-2026:13812
  • Red Hat AI Inference Server 3.2 rhaiis 1779223651, rhaiis 1779223654, rhaiis/model-opt-cuda-rhel9 1780681984
    fixed: vendor fix RHSA-2026:25096
  • Red Hat AI Inference Server 3.3 rhaiis 1778244531, rhaiis 1778244546, rhaiis 1778244559, rhaiis 1778274666
    fixed: vendor fix RHSA-2026:16008
  • Red Hat CodeReady Linux Builder EUS (v.9.4) bsdcat-debuginfo 3.5.3-5.el9_4, bsdtar-debuginfo 3.5.3-5.el9_4, libarchive-devel 3.5.3-5.el9_4, bsdcpio-debuginfo 3.5.3-5.el9_4, libarchive-debuginfo 3.5.3-5.el9_4, libarchive-debugsource 3.5.3-5.el9_4
    fixed: vendor fix RHSA-2026:8873
show 30 more
  • Red Hat Discovery 2 discovery 1778101579, discovery 1778156756
    fixed: vendor fix RHSA-2026:14937
  • Red Hat Enterprise Linux AppStream (v. 9) bsdtar 3.5.3-9.el9_7
    fixed: vendor fix RHSA-2026:8510
  • Red Hat Enterprise Linux AppStream (v. 10) bsdtar 3.7.7-8.el10_1
    fixed: vendor fix RHSA-2026:8492
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) bsdtar 3.5.3-2.el9_0.4
    fixed: vendor fix RHSA-2026:8867
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) bsdtar 3.5.3-5.el9_2.2
    fixed: vendor fix RHSA-2026:8864
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) bsdtar 3.7.7-5.el10_0
    fixed: vendor fix RHSA-2026:8865
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) bsdtar 3.5.3-5.el9_4
    fixed: vendor fix RHSA-2026:8873
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) bsdtar 3.5.3-7.el9_6.1
    fixed: vendor fix RHSA-2026:8866
  • Red Hat Enterprise Linux BaseOS (v. 8) bsdtar 3.3.3-7.el8_10, libarchive 3.3.3-7.el8_10
    fixed: vendor fix RHSA-2026:8534
  • Red Hat Enterprise Linux BaseOS (v. 9) libarchive 3.5.3-9.el9_7
    fixed: vendor fix RHSA-2026:8510
  • Red Hat Enterprise Linux BaseOS (v. 10) libarchive 3.7.7-8.el10_1
    fixed: vendor fix RHSA-2026:8492
  • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) bsdtar 3.3.2-8.el8_2.2, libarchive 3.3.2-8.el8_2.2
    fixed: vendor fix RHSA-2026:8521
  • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bsdtar 3.3.3-1.el8_4.2, libarchive 3.3.3-1.el8_4.2
    fixed: vendor fix RHSA-2026:9592
  • Red Hat Enterprise Linux BaseOS AUS (v.8.6) bsdtar 3.3.3-6.el8_6.1, libarchive 3.3.3-6.el8_6.1 Red Hat Enterprise Linux BaseOS E4S (v.8.6) bsdtar 3.3.3-6.el8_6.1, libarchive 3.3.3-6.el8_6.1
    fixed: vendor fix RHSA-2026:8908
  • Red Hat Enterprise Linux BaseOS E4S (v.8.8) bsdtar 3.3.3-5.el8_8.2, libarchive 3.3.3-5.el8_8.2
    fixed: vendor fix RHSA-2026:9026
  • Red Hat Enterprise Linux BaseOS E4S (v.9.0) libarchive 3.5.3-2.el9_0.4
    fixed: vendor fix RHSA-2026:8867
  • Red Hat Enterprise Linux BaseOS E4S (v.9.2) libarchive 3.5.3-5.el9_2.2
    fixed: vendor fix RHSA-2026:8864
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0) libarchive 3.7.7-5.el10_0
    fixed: vendor fix RHSA-2026:8865
  • Red Hat Enterprise Linux BaseOS EUS (v.9.4) libarchive 3.5.3-5.el9_4
    fixed: vendor fix RHSA-2026:8873
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6) libarchive 3.5.3-7.el9_6.1
    fixed: vendor fix RHSA-2026:8866
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) bsdtar 3.3.3-1.el8_4.2, libarchive 3.3.3-1.el8_4.2
    fixed: vendor fix RHSA-2026:9592
  • Red Hat Enterprise Linux BaseOS TUS (v.8.6) bsdtar 3.3.3-6.el8_6.1, libarchive 3.3.3-6.el8_6.1
    fixed: vendor fix RHSA-2026:8908
  • Red Hat Enterprise Linux BaseOS TUS (v.8.8) bsdtar 3.3.3-5.el8_8.2, libarchive 3.3.3-5.el8_8.2
    fixed: vendor fix RHSA-2026:9026
  • Red Hat Enterprise Linux CRB (v. 8) bsdcat-debuginfo 3.3.3-7.el8_10, bsdtar-debuginfo 3.3.3-7.el8_10, libarchive-devel 3.3.3-7.el8_10, bsdcpio-debuginfo 3.3.3-7.el8_10, libarchive-debuginfo 3.3.3-7.el8_10, libarchive-debugsource 3.3.3-7.el8_10
    fixed: vendor fix RHSA-2026:8534
  • Red Hat Enterprise Linux Server (v. 7 ELS) libarchive 3.1.2-14.el7_9.2 Red Hat Enterprise Linux Server Optional (v. 7 ELS) bsdtar 3.1.2-14.el7_9.2, bsdcpio 3.1.2-14.el7_9.2
    fixed: vendor fix RHSA-2026:8517
  • Red Hat Hardened Images libarchive 3.8.7-1.hum1
    fixed: vendor fix RHSA-2026:8944
  • Red Hat Insights proxy 1.5 insights-proxy 1776868961
    fixed: vendor fix RHSA-2026:9832
  • Red Hat OpenShift Container Platform 4.12 rhcos 412.86.202604281506
    fixed: vendor fix RHSA-2026:12274
  • Red Hat OpenShift Container Platform 4.13 rhcos 413.92.202605271328
    fixed: vendor fix RHSA-2026:21690
  • Red Hat OpenShift Container Platform 4.14 rhcos 414.92.202605060243
    fixed: vendor fix RHSA-2026:15087

6 more fixed, 2 more not affected in the full advisory

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

1.29% chance of exploitation in the next 30 days, higher than 70% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service
  • Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
  • Red Hat Red Hat Enterprise Linux 9.4 Extended Update Support
  • Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support
  • Red Hat Red Hat OpenShift Container Platform 4.12
  • Red Hat Red Hat OpenShift Container Platform 4.13
  • Red Hat Red Hat OpenShift Container Platform 4.14
  • Red Hat Red Hat OpenShift Container Platform 4.15
  • Red Hat Red Hat OpenShift Container Platform 4.16
  • Red Hat Red Hat OpenShift Container Platform 4.17
  • Red Hat Red Hat OpenShift Container Platform 4.18
  • Red Hat Red Hat OpenShift Container Platform 4.19
  • Red Hat RHEL-8 based Middleware Containers
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20
  • Red Hat Red Hat AI Inference Server 3.2
  • Red Hat Red Hat AI Inference Server 3.3
  • Red Hat Red Hat Discovery 2
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Insights proxy 1.5
  • Red Hat Red Hat Update Infrastructure 5
  • Red Hat Red Hat Enterprise Linux 6

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.