Denial of Service Vulnerability in Libarchive Affects Red Hat
CVE-2026-17591

3.6LOW

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:
16 October 2026

What is CVE-2026-17591?

A flaw in Libarchive allows attackers to exploit a use-after-free vulnerability, potentially leading to Denial of Service (DoS) or information disclosure. This issue occurs in the 'archive_entry_copy_mac_metadata()' function, where an internal buffer is deallocated prematurely during a data copy operation. If an attacker is able to supply input to an application using this function, they can trigger a crash or access uninitialized memory, impacting the application’s stability and security.

References

https://access.redhat.com/security/cve/CVE-2026-17591
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2554209
issue-trackingx_refsource_REDHAT
https://github.com/libarchive/libarchive/pull/3318

CVSS V3.1

Score:
3.6
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Local
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank shaohan.X for reporting this issue.
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