CVE-2026-17591: Use-After-Free (CVSS 3.6)

Description

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.

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CVSS v3.1 Score

3.6

LOW

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

Weakness Type (CWE)

CWE-416 Use After Free

References

Other References

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

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 3.6 (LOW).

How severe is CVE-2026-17591? +

CVE-2026-17591 has a CVSS v3.1 score of 3.6 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

How do I check if I'm vulnerable to CVE-2026-17591? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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