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TI-2026-70098 Aliases CVE-2026-108119GHSA-v87q-pcjw-34hc

BusyBox tar writes files outside extraction directory via links

Priority LOW 27CWE-59Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
Required
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
None · High · High
Fix status
Partial Red Hat: 1 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.

Summary

The tar applet in BusyBox does not check that deferred symlink and hardlink targets stay inside the extraction directory when the links are created (CWE-59). An attacker can craft a tar archive that writes files outside the extraction directory, or replace an existing file outside it when a directory is reused across two archives. If the archive is extracted with elevated privileges, this can lead to privilege escalation or arbitrary code execution. The affected products are Red Hat Hardened Images and Red Hat Enterprise Linux 6.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

A flaw was found in busybox. The tar applet's deferred link-creation handling for symlink and hardlink entries with unsafe-looking targets does not validate that the resolved destination remains inside the extraction directory once the deferred link is created. An attacker can craft a tar archive using a symlink target of exactly '..' combined with a deferred hardlink to create a new file outside the extraction directory, or reuse an extraction directory across two archives to replace an existing file outside it. If the archive is extracted with elevated privileges, this flaw can lead to privilege escalation or arbitrary code execution.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00134 2nd percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 1 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat Hardened Images—1.37.0-9.4.hum1Patch availableCNA
Red HatRed Hat Enterprise Linux 6——No fix listedCNA
  • Red Hat Hardened Images VendorRed Hat Affected — Fixed in 1.37.0-9.4.hum1 Patch available CNA
  • Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — No fix listed CNA

CPE names CNA · 2

CPEVersionsRoleVendor
cpe:/a:redhat:hummingbird:11—Red Hat
cpe:/o:redhat:rhel_els:66—Red Hat
  • cpe:/a:redhat:hummingbird:1 Versions 1 — ·Red Hat
  • cpe:/o:redhat:rhel_els:6 Versions 6 — ·Red Hat

Remediation

Update Red Hat Hardened Images to 1.37.0-9.4.hum1, fixed in RHSA-2026:81391. The sources list no fixed version for Red Hat Enterprise Linux 6.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Red Hat 1 advisory

  • RHSA-2026:81391 Released 2026-10-12 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images busybox-1:1.37.0-9.4.hum1@aarch64, busybox-1:1.37.0-9.4.hum1@s390x, busybox-1:1.37.0-9.4.hum1@src +7

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    Red Hat Hardened Images — RHSA-2026:81391

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-73900 Out-of-bounds read in BusyBox dpkg corrupts status filePriority LOW 15
    Show all 2 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix yet: Fix deferred
Red Hat Hardened ImagesFixed RHSA-2026:81391

Timeline

  1. 2026-10-09 Threatist record created from CVE-2026-108119
  2. 2026-10-10 Affected versions changed · Red Hat
  3. 2026-10-10 CVSS score added · Red Hat
  4. 2026-10-11 Priority changed: MEDIUM → LOW
  5. 2026-10-12 Fix available: [email protected] · CNA
  6. 2026-10-12 1 new reference · CNA
  7. 2026-10-13 Alias added: GHSA-v87q-pcjw-34hc
  8. 2026-10-13 Fix available: RHSA-2026:81391 · Red Hat
  9. 2026-10-13 Fix available: Red Hat Hardened Images · Red Hat
  10. 2026-10-13 CISA SSVC decision points changed

References

Advisory 1

Other 2

  • TI-2019-15875 Protection mechanism failure in Jenkins Pipeline: Groovy Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-15874 Protection mechanism failure in Jenkins Script Security Plugin KEVCVSS 3.1CRITICAL 9.9
  • TI-2019-08259 Underflow in PHP-FPM can lead to RCE KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-05363 Code injection in Elastic Kibana KEVCVSS 3.1CRITICAL 10.0
  • TI-2019-03949 Out-of-bounds write in ESXi and Horizon DaaS KEVCVSS 3.1CRITICAL 9.8
  • TI-2018-16080 A code execution vulnerability exists in the Stapler web framework used by Jenkins 2.153… KEVCVSS 3.1CRITICAL 9.8
See all 7413 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences