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    CVE-2026-5121

    A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.

    Published:Mar 30, 2026
    Last Modified:Sep 1, 2026
    EPS:Mar 30, 2026
    EPSS Score:0.01073
    CVSS Score:7.5

    Affected Products

    Vendor
    Libarchive
    Product
    Libarchive
    Vendor
    Redhat
    Product
    Ai Inference Server
    Vendor
    Redhat
    Product
    Discovery
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Hardened Images
    Vendor
    Redhat
    Product
    Hummingbird
    Vendor
    Redhat
    Product
    Insights Proxy
    Vendor
    Redhat
    Product
    Openshift
    Vendor
    Redhat
    Product
    Openshift Container Platform
    Vendor
    Redhat
    Product
    Rhel Aus
    Vendor
    Redhat
    Product
    Rhel E4s
    Vendor
    Redhat
    Product
    Rhel Els
    Vendor
    Redhat
    Product
    Rhel Eus
    Vendor
    Redhat
    Product
    Rhel Eus Long Life
    Vendor
    Redhat
    Product
    Rhel Tus
    Vendor
    Redhat
    Product
    Rhosemc
    Vendor
    Redhat
    Product
    Rhui

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-190 Integer Overflow or Wraparound

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-16517 (CVSS 2.9) — A signed integer overflow vulnerability was found in libarchive's ZIP writer. In the archive_write_zip_header …
    CVE-2026-14164 (CVSS 7.5) — A double free issue has been identified in libarchive's RAR5 reader. During parsing of a specially crafted RAR…
    CVE-2026-5745 (CVSS 5.5) — A flaw was found in libarchive. A NULL pointer dereference vulnerability exists in the ACL parsing logic, spec…
    CVE-2026-4424 (CVSS 7.5) — A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processin…
    CVE-2026-4426 (CVSS 6.5) — A flaw was found in libarchive. An Undefined Behavior vulnerability exists in the zisofs decompression logic, …
    CVE-2025-60753 (CVSS 5.5) — An issue was discovered in libarchive bsdtar before version 3.8.1 in function apply_substitution in file tar/s…
    CVE-2025-5916 (CVSS 3.9) — A vulnerability has been identified in the libarchive library. This flaw involves an integer overflow that can…
    CVE-2025-5918 (CVSS 3.9) — A vulnerability has been identified in the libarchive library. This flaw can be triggered when file streams ar…
    CVE-2025-5917 (CVSS 2.8) — A vulnerability has been identified in the libarchive library. This flaw involves an 'off-by-one' miscalculati…
    CVE-2025-5915 (CVSS 6.6) — A vulnerability has been identified in the libarchive library. This flaw can lead to a heap buffer over-read d…

    References

    https://access.redhat.com/errata/RHSA-2026:10065
    https://access.redhat.com/errata/RHSA-2026:10097
    https://access.redhat.com/errata/RHSA-2026:11768
    https://access.redhat.com/errata/RHSA-2026:12071
    https://access.redhat.com/errata/RHSA-2026:12274
    https://access.redhat.com/errata/RHSA-2026:13812
    https://access.redhat.com/errata/RHSA-2026:14773
    https://access.redhat.com/errata/RHSA-2026:14937
    https://access.redhat.com/errata/RHSA-2026:15087
    https://access.redhat.com/errata/RHSA-2026:16008
    https://access.redhat.com/errata/RHSA-2026:16009
    https://access.redhat.com/errata/RHSA-2026:16030
    https://access.redhat.com/errata/RHSA-2026:16174
    https://access.redhat.com/errata/RHSA-2026:17596
    https://access.redhat.com/errata/RHSA-2026:19724
    https://access.redhat.com/errata/RHSA-2026:19725
    https://access.redhat.com/errata/RHSA-2026:20040
    https://access.redhat.com/errata/RHSA-2026:21690
    https://access.redhat.com/errata/RHSA-2026:25096
    https://access.redhat.com/errata/RHSA-2026:8510
    https://access.redhat.com/errata/RHSA-2026:8517
    https://access.redhat.com/errata/RHSA-2026:8521
    https://access.redhat.com/errata/RHSA-2026:8534
    https://access.redhat.com/errata/RHSA-2026:8864
    https://access.redhat.com/errata/RHSA-2026:8866
    https://access.redhat.com/errata/RHSA-2026:8867
    https://access.redhat.com/errata/RHSA-2026:8873
    https://access.redhat.com/errata/RHSA-2026:8908
    https://access.redhat.com/errata/RHSA-2026:8944
    https://access.redhat.com/errata/RHSA-2026:9026
    https://access.redhat.com/errata/RHSA-2026:9592
    https://access.redhat.com/errata/RHSA-2026:9832
    https://access.redhat.com/security/cve/CVE-2026-5121
    https://bugzilla.redhat.com/show_bug.cgi?id=2452945
    https://github.com/advisories/GHSA-2vwv-vqpv-v8vc
    https://github.com/libarchive/libarchive/pull/2934
    https://cert-portal.siemens.com/productcert/html/ssa-585531.html

    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