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libarchive CVE-2026-4424

| EUVDEUVD-2026-13097 HIGH
Out-of-bounds Read (CWE-125)
2026-03-19 redhat
7.5
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

11
Analysis Updated
Apr 22, 2026 - 07:28 vuln.today
v8 (cvss_changed)
Analysis Updated
Apr 20, 2026 - 14:30 vuln.today
v7 (cvss_changed)
Analysis Updated
Apr 20, 2026 - 08:30 vuln.today
v6 (cvss_changed)
Analysis Updated
Apr 20, 2026 - 06:28 vuln.today
v5 (cvss_changed)
Analysis Updated
Apr 20, 2026 - 05:28 vuln.today
v4 (cvss_changed)
Analysis Updated
Apr 20, 2026 - 04:32 vuln.today
v3 (cvss_changed)
Analysis Updated
Apr 20, 2026 - 03:28 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Apr 16, 2026 - 15:22 vuln.today
cvss_changed
EUVD ID Assigned
Mar 19, 2026 - 14:30 euvd
EUVD-2026-13097
Analysis Generated
Mar 19, 2026 - 14:30 vuln.today
CVE Published
Mar 19, 2026 - 13:50 nvd
HIGH 7.5

DescriptionCVE.org

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.

AnalysisAI

Heap memory disclosure in libarchive allows remote unauthenticated attackers to read sensitive heap data by submitting a malformed RAR archive. The flaw affects Red Hat Enterprise Linux 6-10 and OpenShift Container Platform 4, with vendor patches available per multiple RHSA advisories (RHSA-2026:8492 through RHSA-2026:8908). Despite the HIGH CVSS score of 7.5 and network-exploitable vector requiring no authentication, the EPSS score of 0.14% (35th percentile) indicates low observed exploitation probability. No public exploit code identified at time of analysis, and not listed in CISA KEV, suggesting this remains a patch-and-monitor priority rather than emergency response.

Technical ContextAI

This vulnerability affects libarchive, a widely-used open-source library for reading and writing streaming archives in various formats (tar, cpio, zip, RAR, etc.). The flaw (CWE-125: Out-of-bounds Read) resides in the RAR decompression implementation, specifically in the LZSS (Lempel-Ziv-Storer-Szymanski) sliding window handling logic. LZSS is a dictionary-based compression algorithm that maintains a sliding window buffer for pattern matching. When processing RAR archives that transition between different compression methods, libarchive fails to properly validate and adjust the sliding window size, allowing reads beyond allocated heap boundaries. The affected CPE strings indicate this impacts Red Hat Enterprise Linux versions 6, 7, 8, 9, and 10, plus Red Hat OpenShift Container Platform 4, all of which bundle libarchive as a core system library used by package managers, backup tools, and container runtimes. The upstream fix is tracked in GitHub pull request #2898.

RemediationAI

Apply the vendor-released patches immediately for systems processing untrusted archives. Red Hat Enterprise Linux users should install updates per the applicable RHSA advisory for their version (RHSA-2026:8492 for RHEL 6, RHSA-2026:8510 for RHEL 7, RHSA-2026:8534 for RHEL 8, RHSA-2026:8517 for RHEL 9, RHSA-2026:8521 for RHEL 10, and RHSA-2026:8908 for OpenShift 4), available at https://access.redhat.com/errata/. For upstream libarchive installations, upgrade to a version incorporating GitHub PR #2898. If immediate patching is not feasible, implement compensating controls: (1) restrict processing of RAR archives to trusted sources only by filtering file uploads and email attachments-this eliminates remote attack vectors but may disrupt legitimate workflows requiring RAR support; (2) run archive extraction in sandboxed environments with limited heap memory visibility (containers with memory constraints, SELinux confined processes) to reduce information leakage impact, though this does not prevent the vulnerability itself; (3) disable RAR format support in libarchive if the organization does not require it, though this requires recompilation with specific build flags. Monitor application logs for excessive archive processing errors that might indicate exploitation attempts.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
SUSE Liberty Linux 10 Fixed
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise Desktop 15 SP7 Fixed

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CVE-2026-4424 vulnerability details – vuln.today

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