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CVE-2026-17591

Libarchive: libarchive: use-after-free via aliased mac metadata copy

3.6 LowFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
None
Availability
Low

Exploit likelihood

0.15%Unchanged since Oct 17, 2026
90%50%10%1%

What each source reports

CVE List Score used 3.6

Libarchive: libarchive: use-after-free via aliased mac metadata copy

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.

Record
CVE-2026-17591
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
Weakness
CWE-416
Updated
2026-11-06
EUVDEUVD-2026-103190 3.6

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.

Record
EUVD-2026-103190
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-06
GitHub AdvisoriesGHSA-x7v4-6qhp-jg74 3.6

A flaw was found in libarchive. An attacker can cause a Denial of Service (DoS) or potential...

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.

Record
GHSA-x7v4-6qhp-jg74
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
Weakness
CWE-416
Updated
2026-11-02
NVD 3.6

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.

Record
CVE-2026-17591
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
Weakness
CWE-416
Updated
2026-11-06
OSVBELL-CVE-2026-17591 3.6
Record
BELL-CVE-2026-17591
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-02
OSVDEBIAN-CVE-2026-17591 3.6

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.

Record
DEBIAN-CVE-2026-17591
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-07
Show 8 moreShow less
OSVOESA-2026-4415 3.6

libarchive security update

is an open-source BSD-licensed C programming library that provides streaming access to a variety of different archive formats, including tar, cpio, pax, zip, and ISO9660 images. The distribution also includes bsdtar and bsdcpio, full-featured implementations of tar and cpio that use .

Security Fix(es):

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.(CVE-2026-17591)

Record
OESA-2026-4415
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-02
OSVOESA-2026-4547 3.6

libarchive security update

is an open-source BSD-licensed C programming library that provides streaming access to a variety of different archive formats, including tar, cpio, pax, zip, and ISO9660 images. The distribution also includes bsdtar and bsdcpio, full-featured implementations of tar and cpio that use .

Security Fix(es):

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.(CVE-2026-17591)

Record
OESA-2026-4547
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-02
OSVOESA-2026-4548 3.6

libarchive security update

is an open-source BSD-licensed C programming library that provides streaming access to a variety of different archive formats, including tar, cpio, pax, zip, and ISO9660 images. The distribution also includes bsdtar and bsdcpio, full-featured implementations of tar and cpio that use .

Security Fix(es):

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.(CVE-2026-17591)

Record
OESA-2026-4548
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-02
OSVOESA-2026-4549 3.6

libarchive security update

is an open-source BSD-licensed C programming library that provides streaming access to a variety of different archive formats, including tar, cpio, pax, zip, and ISO9660 images. The distribution also includes bsdtar and bsdcpio, full-featured implementations of tar and cpio that use .

Security Fix(es):

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.(CVE-2026-17591)

Record
OESA-2026-4549
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-02
OSVRHSA-2026:77775 3.6

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:77775
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2026-17591 3.6

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.

Record
UBUNTU-CVE-2026-17591
CVSS 3.1
3.6 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
Updated
2026-11-02
OSVAZL-109785 No score

CVE-2026-17591 affecting package cmake 3.30.3-15

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.

Record
AZL-109785
Updated
2026-11-02
OSVAZL-109788 No score

CVE-2026-17591 affecting package libarchive 3.7.7-7

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.

Record
AZL-109788
Updated
2026-11-05

Affected products

Affected packages

Affected packages
PackageAffectedFixed
cmake
Azure Linux:3
 through 3.30.3-15 None known
libarchive
Azure Linux:3
 through 3.7.7-7 None known
libarchive
Alpaquita:23
 3.6.1-r1 and later None known
libarchive
Alpaquita:25
 3.8.0-r0 and later None known
libarchive
Alpaquita:stream
 3.6.2-r1 up to 3.8.9-r0
3.8.9-r0
libarchive
Debian:12
 All versions, plus listed versions
3.6.2-13.6.2-1+deb12u13.6.2-1+deb12u23.6.2-1+deb12u33.6.2-1+deb12u4
Show 21 moreShow less
3.6.2-1+deb12u53.7.2-13.7.2-1.13.7.2-1.1~exp13.7.2-23.7.2-2.13.7.4-13.7.4-1.13.7.4-23.7.4-33.7.4-43.8.10-13.8.10-23.8.11-13.8.4-13.8.5-13.8.6-13.8.7-13.8.8-13.8.8-23.8.9-1
 None known
libarchive
Debian:13
 All versions, plus listed versions
3.7.4-43.7.4-4+deb13u13.8.10-13.8.10-23.8.11-1
Show 7 moreShow less
3.8.4-13.8.5-13.8.6-13.8.7-13.8.8-13.8.8-23.8.9-1
 None known
libarchive
Debian:14
 before 3.8.9-1, plus listed versions
3.7.4-43.8.4-13.8.5-13.8.6-13.8.7-13.8.8-13.8.8-2
3.8.9-1
libarchive
openEuler:22.03-LTS-SP4
 before 3.5.2-16.oe2203sp4
3.5.2-16.oe2203sp4
libarchive
openEuler:24.03-LTS-SP1
 before 3.7.1-14.oe2403sp1
3.7.1-14.oe2403sp1
Show 15 moreShow less
Affected packages
PackageAffectedFixed
libarchive
openEuler:24.03-LTS-SP3
 before 3.7.1-14.oe2403sp3
3.7.1-14.oe2403sp3
libarchive
openEuler:24.03-LTS-SP4
 before 3.7.1-14.oe2403sp4
3.7.1-14.oe2403sp4
bsdcat
Red Hat:hummingbird:1
 before 0:3.8.9-2.1.hum1
0:3.8.9-2.1.hum1
bsdcpio
Red Hat:hummingbird:1
 before 0:3.8.9-2.1.hum1
0:3.8.9-2.1.hum1
bsdtar
Red Hat:hummingbird:1
 before 0:3.8.9-2.1.hum1
0:3.8.9-2.1.hum1
bsdunzip
Red Hat:hummingbird:1
 before 0:3.8.9-2.1.hum1
0:3.8.9-2.1.hum1
libarchive
Red Hat:hummingbird:1
 before 0:3.8.9-2.1.hum1
0:3.8.9-2.1.hum1
libarchive-devel
Red Hat:hummingbird:1
 before 0:3.8.9-2.1.hum1
0:3.8.9-2.1.hum1
libarchive
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
3.1.2-5ubuntu13.1.2-7ubuntu13.1.2-7ubuntu23.1.2-7ubuntu2.13.1.2-7ubuntu2.2
Show 9 moreShow less
3.1.2-7ubuntu2.33.1.2-7ubuntu2.43.1.2-7ubuntu2.63.1.2-7ubuntu2.73.1.2-7ubuntu2.83.1.2-7ubuntu2.8+esm13.1.2-7ubuntu2.8+esm33.1.2-7ubuntu2.8+esm43.1.2-7ubuntu2.8+esm5
 None known
libarchive
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
3.1.2-11build13.1.2-11ubuntu0.16.04.13.1.2-11ubuntu0.16.04.23.1.2-11ubuntu0.16.04.33.1.2-11ubuntu0.16.04.4
Show 7 moreShow less
3.1.2-11ubuntu0.16.04.53.1.2-11ubuntu0.16.04.63.1.2-11ubuntu0.16.04.73.1.2-11ubuntu0.16.04.83.1.2-11ubuntu0.16.04.8+esm13.1.2-11ubuntu0.16.04.8+esm23.1.2-11ubuntu0.16.04.8+esm3
 None known
libarchive
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
3.2.2-3.13.2.2-3.1ubuntu0.13.2.2-3.1ubuntu0.23.2.2-3.1ubuntu0.33.2.2-3.1ubuntu0.4
Show 6 moreShow less
3.2.2-3.1ubuntu0.53.2.2-3.1ubuntu0.63.2.2-3.1ubuntu0.73.2.2-3.1ubuntu0.7+esm13.2.2-3.1ubuntu0.7+esm23.2.2-3.1ubuntu0.7+esm3
 None known
libarchive
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
3.4.0-13.4.0-1build13.4.0-1ubuntu23.4.0-2ubuntu13.4.0-2ubuntu1.1
Show 7 moreShow less
3.4.0-2ubuntu1.23.4.0-2ubuntu1.33.4.0-2ubuntu1.43.4.0-2ubuntu1.53.4.0-2ubuntu1.5+esm13.4.0-2ubuntu1.5+esm23.4.0-2ubuntu1.5+esm3
 None known
libarchive
Ubuntu:22.04:LTS
 All versions, plus listed versions
3.4.3-23.4.3-2build13.5.2-13.5.2-1ubuntu13.6.0-1ubuntu1
Show 9 moreShow less
3.6.0-1ubuntu1.13.6.0-1ubuntu1.23.6.0-1ubuntu1.33.6.0-1ubuntu1.43.6.0-1ubuntu1.53.6.0-1ubuntu1.63.6.0-1ubuntu1.73.6.0-1ubuntu1.83.6.0-1ubuntu1.9
 None known
libarchive
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.6.2-1ubuntu13.7.2-1ubuntu13.7.2-1ubuntu23.7.2-1.1ubuntu23.7.2-2
Show 9 moreShow less
3.7.2-2ubuntu0.13.7.2-2ubuntu0.23.7.2-2ubuntu0.33.7.2-2ubuntu0.43.7.2-2ubuntu0.53.7.2-2ubuntu0.63.7.2-2ubuntu0.73.7.2-2ubuntu0.83.7.2-2ubuntu0.9
 None known
libarchive
Ubuntu:26.04:LTS
 All versions, plus listed versions
3.7.7-0ubuntu33.8.5-1ubuntu13.8.5-1ubuntu23.8.5-1ubuntu2.13.8.5-1ubuntu2.23.8.5-1ubuntu2.3
 None known

History

History
RecordedChangedSources
affectedNVD, OSV
productsCVE List, EUVD
factsOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-17591 is a low vulnerability (CVSS 3.6) in Red Hat Enterprise Linux 10, published October 16, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.15%, the 4th percentile. Fixed in libarchive 3.8.9-r0.

References

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