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Fencer Vulns
medium 5.0

CVE-2026-5704 json

Tar: tar: hidden file injection via crafted archives

published 2026-04-06 7 mo ago modified 2026-11-05 3 d ago also EUVD-2026-19317

cvss
5.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

A flaw was found in tar. A remote attacker could exploit this vulnerability by crafting a malicious archive, leading to hidden file injection with fully attacker-controlled content. This bypasses pre-extraction inspection mechanisms, potentially allowing an attacker to introduce malicious files onto a system without detection.

Patch / fix

  • Red Hat Red Hat Enterprise Linux 10 2:1.35-13.el10_2
  • Red Hat Red Hat Enterprise Linux 8 2:1.30-13.el8_10
  • Red Hat Red Hat Enterprise Linux 9 2:1.34-13.el9_8
  • Red Hat Red Hat Discovery 2 1788205779
  • Red Hat Red Hat Hardened Images 1.35-10.hum1
  • Red Hat Red Hat Update Infrastructure 5 1788765051, 1788880445, 1788880456, 1788880464, 1788880581
  • tar Ubuntu 22.04 LTS 1.34+dfsg-1ubuntu0.1.22.04.6
  • tar Ubuntu 24.04 LTS 1.35+dfsg-3ubuntu0.4
  • tar Ubuntu 26.04 LTS 1.35+dfsg-4ubuntu0.4
  • tar Ubuntu Pro 14.04 LTS 1.27.1-1ubuntu0.1+esm7
  • tar Ubuntu Pro 16.04 LTS 1.28-2.1ubuntu0.2+esm6
  • tar Ubuntu Pro 18.04 LTS 1.29b-2ubuntu0.4+esm4
  • tar Ubuntu Pro 20.04 LTS 1.30+dfsg-7ubuntu0.20.04.4+esm3

ubuntu advisories UBUNTU-CVE-2026-5704

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • tar RHEL 8 2:1.30-13.el8_10
  • tar hummingbird 1 1.35-10.hum1
  • tar RHEL 10.2 2:1.35-13.el10_2
  • tar RHEL 9 2:1.34-13.el9_8

red hat advisories RHSA-2026:70390RHSA-2026:66514RHSA-2026:61586RHSA-2026:61581

  • tar SLES for SAP 15 SP6, SLES for SAP 15 SP5, SLES for SAP 15 SP4 +11 more 1.34-150000.3.42.1
  • tar SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.35-160000.4.1

suse advisories SUSE-SU-2026:2714-1SUSE-SU-2026:22289-1SUSE-SU-2026:22377-1

  • tar openSUSE Leap 16.0 1.35-160000.4.1
  • tar openSUSE Tumbleweed 1.35-8.1

opensuse advisories openSUSE-SU-2026:21070-1openSUSE-SU-2026:11125-1

  • tar AlmaLinux 8 2:1.30-13.el8_10
  • tar AlmaLinux 9 2:1.34-13.el9_8
  • tar AlmaLinux 10 2:1.35-13.el10_2

almalinux advisories ALSA-2026:70390ALSA-2026:61581ALSA-2026:61586

  • tar Rocky Linux 8 2:1.30-13.el8_10
  • tar Rocky Linux 10 2:1.35-13.el10_2
  • tar Rocky Linux 9 2:1.34-13.el9_8

rocky linux advisories RLSA-2026:70390RLSA-2026:61586RLSA-2026:61581

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-5704 updated cvss 5.0

tar: tar: Hidden file injection via crafted archives

  • Red Hat Enterprise Linux 6 tar Red Hat Enterprise Linux 7 tar
    affected: workaround, no fix available “To mitigate this issue, avoid extracting archives from untrusted sources. If processing untrusted archives is necessary, do so within a sandboxed environment to limit potential impact.”
  • Red Hat Discovery 2 discovery/discovery-server-rhel9 1788205779
    fixed: vendor fix “To mitigate this issue, avoid extracting archives from untrusted sources. If processing untrusted archives is necessary, do so within a sandboxed environment to limit potential impact.” RHSA-2026:61783
  • Red Hat Enterprise Linux BaseOS (v. 8) tar 1.30-13.el8_10
    fixed: vendor fix “To mitigate this issue, avoid extracting archives from untrusted sources. If processing untrusted archives is necessary, do so within a sandboxed environment to limit potential impact.” RHSA-2026:70390
  • Red Hat Enterprise Linux BaseOS (v. 9) tar 1.34-13.el9_8
    fixed: vendor fix “To mitigate this issue, avoid extracting archives from untrusted sources. If processing untrusted archives is necessary, do so within a sandboxed environment to limit potential impact.” RHSA-2026:61581
  • Red Hat Enterprise Linux BaseOS (v. 10) tar 1.35-13.el10_2
    fixed: vendor fix “To mitigate this issue, avoid extracting archives from untrusted sources. If processing untrusted archives is necessary, do so within a sandboxed environment to limit potential impact.” RHSA-2026:61586
  • Red Hat Hardened Images tar 1.35-10.hum1
    fixed: vendor fix “To mitigate this issue, avoid extracting archives from untrusted sources. If processing untrusted archives is necessary, do so within a sandboxed environment to limit potential impact.” RHSA-2026:66514
  • Red Hat Update Infrastructure 5 rhui5/cds-rhel9 1788880464, rhui5/rhua-rhel9 1788880581, rhui5/haproxy-rhel9 1788880456, rhui5/installer-rhel9 1788765051, rhui5/cds-kubernetes-rhel9 1788880445
    fixed: vendor fix “To mitigate this issue, avoid extracting archives from untrusted sources. If processing untrusted archives is necessary, do so within a sandboxed environment to limit potential impact.” RHSA-2026:66018
  • Red Hat Discovery 2 discovery/discovery-ui-rhel9 1788206196
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.47% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2455360 referenced PoC, tagged "exploit" by a source, unverified
  • openwall.com http://www.openwall.com/lists/oss-security/2026/04/11/10 referenced PoC, tagged "exploit" by a source, unverified
  • openwall.com http://www.openwall.com/lists/oss-security/2026/04/12/2 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.0 CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat Discovery 2
  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Update Infrastructure 5
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7

Classification

Weakness
  • CWE-434 Unrestricted Upload of File with Dangerous Type

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.