Integer Overflow Vulnerability in libarchive Affecting 32-bit Systems
CVE-2026-5121

9.8CRITICAL

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:
30 March 2026

What is CVE-2026-5121?

An integer overflow vulnerability has been identified in libarchive specifically affecting 32-bit systems. This flaw resides in the zisofs block pointer allocation logic, allowing a remote attacker to exploit it by delivering a crafted ISO9660 image. Successful exploitation can lead to a heap buffer overflow, potentially enabling arbitrary code execution on the compromised system. It is crucial for users of libarchive to apply the necessary updates to mitigate this risk.

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References

https://access.redhat.com/security/cve/CVE-2026-5121
vdb-entryx_refsource_REDHAT
https://github.com/libarchive/libarchive/pull/2934

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
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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