CVE Feed

    Dashboard / CVE / CVE-2026-18508

    CVE-2026-18508

    A flaw was found in GNU tar. When extracting an archive with the --one-top-level option, hardlink targets are not confined to the designated top-level directory and may resolve relative to the extraction working directory. A crafted archive can create hardlinks that escape the intended boundary and, when combined with a preexisting symbolic link under the working directory, may allow writing outside that boundary during a single extraction.

    Published:Jul 31, 2026
    Last Modified:Sep 10, 2026
    EPS:Aug 3, 2026
    EPSS Score:0.00141
    CVSS Score:4.4

    Affected Products

    Vendor
    Gnu
    Product
    Tar
    Vendor
    Redhat
    Product
    Discovery
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Hardened Images
    Vendor
    Redhat
    Product
    Hummingbird
    Vendor
    Redhat
    Product
    Openshift
    Vendor
    Redhat
    Product
    Openshift Container Platform
    Vendor
    Redhat
    Product
    Rhui

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-18477 (CVSS 4.4) — A TOCTOU (Time-of-Check Time-of-Use) vulnerability in GNU tar's incremental dumpdir 'X' rename handling allows…
    CVE-2026-5704 (CVSS 5) — A flaw was found in tar. A remote attacker could exploit this vulnerability by crafting a malicious archive, l…
    CVE-2025-45582 (CVSS 4.1) — GNU Tar through 1.35 allows file overwrite via directory traversal in crafted TAR archives, with a certain two…
    CVE-2023-39804 (CVSS 6.2) — In GNU tar before 1.35, mishandled extension attributes in a PAX archive can lead to an application crash in x…
    CVE-2022-48303 (CVSS 5.5) — GNU Tar through 1.34 has a one-byte out-of-bounds read that results in use of uninitialized memory for a condi…
    CVE-2021-20193 (CVSS 3.3) — A flaw was found in the src/list.c of tar 1.33 and earlier. This flaw allows an attacker who can submit a craf…
    CVE-2019-9923 (CVSS 7.5) — pax_decode_header in sparse.c in GNU Tar before 1.32 had a NULL pointer dereference when parsing certain archi…
    CVE-2018-20482 (CVSS 4.7) — GNU Tar through 1.30, when --sparse is used, mishandles file shrinkage during read access, which allows local …
    CVE-2016-6321 (CVSS 7.5) — Directory traversal vulnerability in the safer_name_suffix function in GNU tar 1.14 through 1.29 might allow r…
    CVE-2010-0624 (CVSS 6.8) — Heap-based buffer overflow in the rmt_read__ function in lib/rtapelib.c in the rmt client functionality in GNU…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High