Heap Out-of-Bounds Read Vulnerability in Libarchive Affects Multiple Versions
CVE-2026-4424

7.5HIGH

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
19 March 2026

What is CVE-2026-4424?

A security flaw has been identified in libarchive, specifically in its handling of RAR archive processing. This vulnerability is due to inadequate validation of the LZSS sliding window size during method transitions within the compression logic. Attackers can exploit this issue by creating specially crafted RAR archives that lead to the disclosure of sensitive heap memory information. This exploit can be executed remotely without requiring any form of authentication or interaction from the user, posing significant risks to systems utilizing affected versions of libarchive.

References

https://access.redhat.com/security/cve/CVE-2026-4424
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2449006
issue-trackingx_refsource_REDHAT
https://github.com/libarchive/libarchive/pull/2898

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Elhanan Haenel for reporting this issue.
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