CVE-2026-17591

A flaw was found in libarchive. An attacker can cause a Denial of Service (DoS) or potential information disclosure due to a use-after-free vulnerability, which occurs when a program reads memory that has already been released. This issue arises when the archive_entry_copy_mac_metadata() function deallocates an internal buffer before completing a data copy. An attacker who can supply input to an application utilizing this function can trigger the flaw to crash the application or read uninitialized memory data.

CVSS 3.1

3.6CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L

EPSS

0.2% chance of exploitation in the next 30 days; higher than 4% of CVEs (scores of 2026-10-25)

CWE

CWE-416

Published

2026-10-16

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

References

• https://access.redhat.com/errata/RHSA-2026:77775
• https://access.redhat.com/security/cve/CVE-2026-17591
• https://bugzilla.redhat.com/show_bug.cgi?id=2554209
• https://github.com/libarchive/libarchive/pull/3318

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