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CVE-2026-18477

Tar: tar: toctou in incremental dumpdir 'x' rename handling allows restore path escape

4.4 MediumFix available

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
Low
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
High
Availability
None

Exploit likelihood

0.10%Unchanged since Aug 4, 2026
90%50%10%1%

What each source reports

CVE List Score used 4.4

Tar: tar: toctou in incremental dumpdir 'x' rename handling allows restore path escape

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.

Record
CVE-2026-18477
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Weakness
CWE-367
Updated
2026-11-05
EUVDEUVD-2026-52336 4.4

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.

Record
EUVD-2026-52336
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-05
GitHub AdvisoriesGHSA-v7fx-gjvh-347c 4.4

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename...

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.

Record
GHSA-v7fx-gjvh-347c
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Weakness
CWE-367
Updated
2026-11-02
NVD 4.4

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.

Record
CVE-2026-18477
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Weakness
CWE-367
Updated
2026-11-05
OSVDEBIAN-CVE-2026-18477 4.4

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.

Record
DEBIAN-CVE-2026-18477
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVJLSEC-2026-1344 4.4

TOCTOU in GNU tar allows unauthorized file modification by a local attacker

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.

Record
JLSEC-2026-1344
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
Show 20 moreShow less
OSVOESA-2026-3597 4.4

tar security update

GNU Tar provides the ability to create tar archives, as well as various other kinds of manipulation. For example, you can use Tar on previously created archives to extract files, to store additional files, or to update or list files which were already stored.

Security Fix(es):

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.(CVE-2026-18477)

Record
OESA-2026-3597
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVOESA-2026-3598 4.4

tar security update

GNU Tar provides the ability to create tar archives, as well as various other kinds of manipulation. For example, you can use Tar on previously created archives to extract files, to store additional files, or to update or list files which were already stored.

Security Fix(es):

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.(CVE-2026-18477)

Record
OESA-2026-3598
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVOESA-2026-3599 4.4

tar security update

GNU Tar provides the ability to create tar archives, as well as various other kinds of manipulation. For example, you can use Tar on previously created archives to extract files, to store additional files, or to update or list files which were already stored.

Security Fix(es):

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.(CVE-2026-18477)

Record
OESA-2026-3599
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVOESA-2026-3600 4.4

tar security update

GNU Tar provides the ability to create tar archives, as well as various other kinds of manipulation. For example, you can use Tar on previously created archives to extract files, to store additional files, or to update or list files which were already stored.

Security Fix(es):

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.(CVE-2026-18477)

Record
OESA-2026-3600
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVOESA-2026-3870 4.4

tar security update

GNU Tar provides the ability to create tar archives, as well as various other kinds of manipulation. For example, you can use Tar on previously created archives to extract files, to store additional files, or to update or list files which were already stored.

Security Fix(es):

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.(CVE-2026-18477)

Record
OESA-2026-3870
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVRHSA-2026:49361 4.4

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Record
RHSA-2026:49361
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVRHSA-2026:61581 5.0

Red Hat Security Advisory: tar security, bug fix, and enhancement update

Record
RHSA-2026:61581
CVSS 3.1
5.0 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVRHSA-2026:61586 5.0

Red Hat Security Advisory: tar security, bug fix, and enhancement update

Record
RHSA-2026:61586
CVSS 3.1
5.0 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVRHSA-2026:70390 5.6

Red Hat Security Advisory: tar security, bug fix, and enhancement update

Record
RHSA-2026:70390
CVSS 3.1
5.6 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVRLSA-2026:61581 5.0

Moderate: tar security, bug fix, and enhancement update

The GNU tar program can save multiple files in an archive and restore files from an archive.

Security Fix(es):

  • tar: tar: Hidden file injection via crafted archives (CVE-2026-5704)

  • tar: tar: TOCTOU in incremental dumpdir 'X' rename handling allows restore path escape (CVE-2026-18477)

  • tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite (CVE-2026-18508)

Bug Fix(es) and Enhancement(s):

  • tar: --one-top-level with absolute path fails [rhel-9] (JIRA:Rocky Linux-144021)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2026:61581
CVSS 3.1
5.0 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVRLSA-2026:61586 5.0

Moderate: tar security, bug fix, and enhancement update

The GNU tar program can save multiple files in an archive and restore files from an archive.

Security Fix(es):

  • tar: tar: Hidden file injection via crafted archives (CVE-2026-5704)

  • tar: tar: TOCTOU in incremental dumpdir 'X' rename handling allows restore path escape (CVE-2026-18477)

  • tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite (CVE-2026-18508)

Bug Fix(es) and Enhancement(s):

  • tar: --one-top-level with absolute path fails (JIRA:Rocky Linux-143906)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2026:61586
CVSS 3.1
5.0 MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVRLSA-2026:70390 5.6

Moderate: tar security, bug fix, and enhancement update

The GNU tar program can save multiple files in an archive and restore files from an archive.

Security Fix(es):

  • tar: Tar path traversal (CVE-2025-45582)

  • tar: tar: Hidden file injection via crafted archives (CVE-2026-5704)

  • tar: tar: TOCTOU in incremental dumpdir 'X' rename handling allows restore path escape (CVE-2026-18477)

  • tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite (CVE-2026-18508)

Bug Fix(es) and Enhancement(s):

  • tar: --one-top-level with absolute path fails [rhel-8.10.z] (JIRA:Rocky Linux-144019)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
RLSA-2026:70390
CVSS 3.1
5.6 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2026-18477 4.4

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.

Record
UBUNTU-CVE-2026-18477
CVSS 3.1
4.4 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVALSA-2026:61581 No score

Moderate: tar security, bug fix, and enhancement update

The GNU tar program can save multiple files in an archive and restore files from an archive.

Security Fix(es):

  • tar: tar: Hidden file injection via crafted archives (CVE-2026-5704)
  • tar: tar: TOCTOU in incremental dumpdir 'X' rename handling allows restore path escape (CVE-2026-18477)
  • tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite (CVE-2026-18508)

Bug Fix(es) and Enhancement(s):

  • tar: --one-top-level with absolute path fails [almalinux-9] (JIRA:AlmaLinux-144021)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
ALSA-2026:61581
Updated
2026-11-02
OSVALSA-2026:61586 No score

Moderate: tar security, bug fix, and enhancement update

The GNU tar program can save multiple files in an archive and restore files from an archive.

Security Fix(es):

  • tar: tar: Hidden file injection via crafted archives (CVE-2026-5704)
  • tar: tar: TOCTOU in incremental dumpdir 'X' rename handling allows restore path escape (CVE-2026-18477)
  • tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite (CVE-2026-18508)

Bug Fix(es) and Enhancement(s):

  • tar: --one-top-level with absolute path fails (JIRA:AlmaLinux-143906)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
ALSA-2026:61586
Updated
2026-11-02
OSVALSA-2026:70390 No score

Moderate: tar security, bug fix, and enhancement update

The GNU tar program can save multiple files in an archive and restore files from an archive.

Security Fix(es):

  • tar: Tar path traversal (CVE-2025-45582)
  • tar: tar: Hidden file injection via crafted archives (CVE-2026-5704)
  • tar: tar: TOCTOU in incremental dumpdir 'X' rename handling allows restore path escape (CVE-2026-18477)
  • tar: tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite (CVE-2026-18508)

Bug Fix(es) and Enhancement(s):

  • tar: --one-top-level with absolute path fails [almalinux-8.10.z] (JIRA:AlmaLinux-144019)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Record
ALSA-2026:70390
Updated
2026-11-02
OSVAZL-94602 No score

CVE-2026-18477 affecting package tar 1.35-3

A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows a local attacker with write access to a directory being backed up to influence the restore process if the attacker has access to the system where the restore is being performed. During restoration, files or directories may be created, renamed or overwritten outside the intended extraction directory. This could lead to unauthorized file modification or, in some cases, privilege escalation. Exploitation does not require the attacker to modify or craft the archive, and standard backup and restore workflows—including extracting into a newly created directory without using the -P option do not mitigate the issue.

Record
AZL-94602
Updated
2026-11-05
OSVCLSA-2026-1787335320 No score

tar: Fix of CVE-2026-18477

  • CVE-2026-18477: apply safer_name_suffix to incremental dumpdir 'X' entries so the temporary directory template can no longer escape the extraction directory
  • use mkdtempat instead of mkdtemp so the 'X' temporary directory is created relative to -C (backport of upstream d479b2cc)
Record
CLSA-2026-1787335320
Updated
2026-11-02
OSVCLSA-2026-1787337920 No score

tar: Fix of CVE-2026-18477

  • CVE-2026-18477: apply safer_name_suffix to incremental dumpdir 'X' entries so the temporary directory template can no longer escape the extraction directory
  • use mkdtempat instead of mkdtemp so the 'X' temporary directory is created relative to -C (backport of upstream d479b2cc)
Record
CLSA-2026-1787337920
Updated
2026-11-02
OSVMGASA-2026-0401 No score

Updated tar packages fix security vulnerabilities

GNU Tar through 1.35 allows file overwrite via directory traversal in crafted TAR archives, with a certain two-step process. (CVE-2025-45582) Tar: toctou in incremental dumpdir 'x' rename handling allows restore path escape. (CVE-2026-18477) Tar: --one-top-level hardlink targets not confined to top-level directory enabling arbitrary file overwrite. (CVE-2026-18508)

Record
MGASA-2026-0401
Updated
2026-11-02

Affected products

Show 1 moreShow less

Affected packages

Affected packages
PackageAffectedFixed
tar
AlmaLinux:9
From an advisory covering 3 CVEs
 before 2:1.34-13.el9_8
2:1.34-13.el9_8
tar
AlmaLinux:10
From an advisory covering 3 CVEs
 before 2:1.35-13.el10_2
2:1.35-13.el10_2
tar
AlmaLinux:8
From an advisory covering 4 CVEs
 before 2:1.30-13.el8_10
2:1.30-13.el8_10
tar
Azure Linux:3
 through 1.35-3 None known
tar
TuxCare:AlmaLinux:9.6
 before 2:1.34-7.el9.tuxcare.els4
2:1.34-7.el9.tuxcare.els4
tar
TuxCare:AlmaLinux:9.2
 before 2:1.34-7.el9.tuxcare.els4
2:1.34-7.el9.tuxcare.els4
tar
Debian:12
 All versions, plus listed versions
1.34+dfsg-1.21.34+dfsg-1.2+deb12u11.34+dfsg-1.31.34+dfsg-1.41.35+dfsg-1
Show 8 moreShow less
1.35+dfsg-21.35+dfsg-31.35+dfsg-3.11.35+dfsg-41.35+dfsg-51.35+dfsg-5+hurd.11.35+dfsg-61.35+dfsg-7
 None known
tar
Debian:13
 All versions, plus listed versions
1.35+dfsg-3.11.35+dfsg-41.35+dfsg-51.35+dfsg-5+hurd.11.35+dfsg-61.35+dfsg-7
 None known
tar
Debian:14
 All versions, plus listed versions
1.35+dfsg-3.11.35+dfsg-41.35+dfsg-51.35+dfsg-5+hurd.11.35+dfsg-61.35+dfsg-7
 None known
Tar_jll
Julia
 1.35.0+0 and later None known
Show 28 moreShow less
Affected packages
PackageAffectedFixed
tar
Mageia:10
From an advisory covering 3 CVEs
 before 1.35-4.1.mga10
1.35-4.1.mga10
tar
Mageia:9
From an advisory covering 3 CVEs
 before 1.35-4.1.mga9
1.35-4.1.mga9
tar
openEuler:24.03-LTS-SP1
 before 1.35-7.oe2403sp1
1.35-7.oe2403sp1
tar
openEuler:24.03-LTS-SP3
 before 1.35-7.oe2403sp3
1.35-7.oe2403sp3
tar
openEuler:20.03-LTS-SP4
 before 1.32-7.oe2003sp4
1.32-7.oe2003sp4
tar
openEuler:22.03-LTS-SP4
 before 1.34-9.oe2203sp4
1.34-9.oe2203sp4
tar
openEuler:24.03-LTS-SP4
 before 1.35-7.oe2403sp4
1.35-7.oe2403sp4
tar
Red Hat:hummingbird:1
 before 0:1.35-9.1.hum1
0:1.35-9.1.hum1
tar
Red Hat:enterprise_linux:9::baseos
From an advisory covering 3 CVEs
 before 2:1.34-13.el9_8
2:1.34-13.el9_8
tar-debuginfo
Red Hat:enterprise_linux:9::baseos
From an advisory covering 3 CVEs
 before 2:1.34-13.el9_8
2:1.34-13.el9_8
tar-debugsource
Red Hat:enterprise_linux:9::baseos
From an advisory covering 3 CVEs
 before 2:1.34-13.el9_8
2:1.34-13.el9_8
tar
Red Hat:enterprise_linux:10.2
From an advisory covering 3 CVEs
 before 2:1.35-13.el10_2
2:1.35-13.el10_2
tar-debuginfo
Red Hat:enterprise_linux:10.2
From an advisory covering 3 CVEs
 before 2:1.35-13.el10_2
2:1.35-13.el10_2
tar-debugsource
Red Hat:enterprise_linux:10.2
From an advisory covering 3 CVEs
 before 2:1.35-13.el10_2
2:1.35-13.el10_2
tar
Red Hat:enterprise_linux:8::baseos
From an advisory covering 4 CVEs
 before 2:1.30-13.el8_10
2:1.30-13.el8_10
tar-debuginfo
Red Hat:enterprise_linux:8::baseos
From an advisory covering 4 CVEs
 before 2:1.30-13.el8_10
2:1.30-13.el8_10
tar-debugsource
Red Hat:enterprise_linux:8::baseos
From an advisory covering 4 CVEs
 before 2:1.30-13.el8_10
2:1.30-13.el8_10
tar
Rocky Linux:9
From an advisory covering 3 CVEs
 before 2:1.34-13.el9_8
2:1.34-13.el9_8
tar
Rocky Linux:10
From an advisory covering 3 CVEs
 before 2:1.35-13.el10_2
2:1.35-13.el10_2
tar
Rocky Linux:8
From an advisory covering 4 CVEs
 before 2:1.30-13.el8_10
2:1.30-13.el8_10
tar
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
1.26+dfsg-81.27-31.27-41.27.1-11.27.1-1ubuntu0.1
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1.27.1-1ubuntu0.1+esm11.27.1-1ubuntu0.1+esm21.27.1-1ubuntu0.1+esm31.27.1-1ubuntu0.1+esm41.27.1-1ubuntu0.1+esm51.27.1-1ubuntu0.1+esm61.27.1-1ubuntu0.1+esm7
 None known
tar
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1.27.1-21.28-2ubuntu11.28-2.11.28-2.1ubuntu0.11.28-2.1ubuntu0.2
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1.28-2.1ubuntu0.2+esm11.28-2.1ubuntu0.2+esm21.28-2.1ubuntu0.2+esm31.28-2.1ubuntu0.2+esm41.28-2.1ubuntu0.2+esm51.28-2.1ubuntu0.2+esm6
 None known
tar
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1.29b-21.29b-2ubuntu0.11.29b-2ubuntu0.21.29b-2ubuntu0.31.29b-2ubuntu0.4
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1.29b-2ubuntu0.4+esm11.29b-2ubuntu0.4+esm21.29b-2ubuntu0.4+esm31.29b-2ubuntu0.4+esm4
 None known
tar
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
1.30+dfsg-61.30+dfsg-71.30+dfsg-7ubuntu0.20.04.11.30+dfsg-7ubuntu0.20.04.21.30+dfsg-7ubuntu0.20.04.3
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1.30+dfsg-7ubuntu0.20.04.41.30+dfsg-7ubuntu0.20.04.4+esm11.30+dfsg-7ubuntu0.20.04.4+esm21.30+dfsg-7ubuntu0.20.04.4+esm3
 None known
tar
Ubuntu:22.04:LTS
 All versions, plus listed versions
1.34+dfsg-1build11.34+dfsg-1build21.34+dfsg-1build31.34+dfsg-1ubuntu0.1.22.04.11.34+dfsg-1ubuntu0.1.22.04.2
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1.34+dfsg-1ubuntu0.1.22.04.31.34+dfsg-1ubuntu0.1.22.04.41.34+dfsg-1ubuntu0.1.22.04.51.34+dfsg-1ubuntu0.1.22.04.6
 None known
tar
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.34+dfsg-1.2ubuntu11.34+dfsg-1.2ubuntu21.34+dfsg-1.3ubuntu11.34+dfsg-1.41.35+dfsg-2~build1
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1.35+dfsg-21.35+dfsg-31.35+dfsg-3build11.35+dfsg-3ubuntu0.11.35+dfsg-3ubuntu0.21.35+dfsg-3ubuntu0.31.35+dfsg-3ubuntu0.4
 None known
tar
Ubuntu:26.10
 All versions, plus listed versions
1.35+dfsg-41.35+dfsg-5ubuntu1
 None known
tar
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.35+dfsg-3.1build11.35+dfsg-3.1build21.35+dfsg-41.35+dfsg-4ubuntu0.11.35+dfsg-4ubuntu0.21.35+dfsg-4ubuntu0.31.35+dfsg-4ubuntu0.4
 None known

History

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

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

In short

CVE-2026-18477 is a medium vulnerability (CVSS 4.4) in Gnu Tar, published August 3, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.10%, the 1st percentile. Fixed in tar 2:1.34-7.el9.tuxcare.els4.

References

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