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CVE.org (no NVD analysis yet)· CNA redhat

CVE-2026-108119: Busybox: busybox: tar extraction-root escape via deferred symlink/hardlink creation bypasses cve-2026-26158 fix

MediumCVSS 6.3 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 25/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.13% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. A user must open a link or visit a page. Special conditions such as timing or configuration are required.
  • Fixed version: azl3 busybox 1.36.1-27 on Azure Linux 3.0 Release Notes; azl3 busybox 1.36.1-28 on Azure Linux 3.0 Release Notes.

Low priority for now. Upgrade to azl3 busybox 1.36.1-27 on Azure Linux 3.0 Release Notes; azl3 busybox 1.36.1-28 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published
Oct 9, 2026
Updated
Nov 5, 2026
EPSS
0.1% · 2th percentile

Report tools

JSON

Action score

25

Monitor

Low priority for now.

CVSS
25 / 40 · 6.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
6.3
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-108119

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsaffected

  • Red Hat Red Hat Hardened Images

    • 1.37.0-9.4.hum1 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12busyboxfrom 0—
openSUSE:Tumbleweedbusyboxbefore 1.38.0-4.11.38.0-4.1
Red Hat:hummingbird:1busyboxbefore 0:1.37.0-9.4.hum10:1.37.0-9.4.hum1
Red Hat:hummingbird:1busybox-petitbootbefore 0:1.37.0-9.4.hum10:1.37.0-9.4.hum1
Red Hat:hummingbird:1busybox-sharedbefore 0:1.37.0-9.4.hum10:1.37.0-9.4.hum1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-12744Abrt: command-injection in abrt leading to local privilege escalation
    35Monitor
  • CVE-2026-90947Gimp: gimp: out-of-bounds write in lighting effects plugin via crafted preset file
    31Monitor
  • CVE-2026-90949Gimp: gimp: heap-based buffer overflow in psp loader due to selection-channel geometry mismatch
    31Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-102474Sep 29, 2026 · Dash: dash: heap out-of-bounds write in conv_escape via undersized unicode escape reservation
    16Monitor
  • ← EarlierCVE-2026-107651Oct 8, 2026 · Eog: eog: arbitrary code execution via heap buffer overflow in png metadata reader
    22Monitor
  • Later →CVE-2026-105959Oct 16, 2026 · Spice-server: spice: heap buffer overflow via glz dictionary max_encoders integer truncation
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 busybox 1.36.1-27 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 busybox 1.36.1-28 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
opensuse:busybox1.38.0-4.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:busybox0:1.37.0-9.4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:busybox-petitboot0:1.37.0-9.4.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:busybox-shared0:1.37.0-9.4.hum1 · Red Hat:hummingbird:1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recorded+4 d
  3. TodayNov 13, 2026+35 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-12474433 days apartBusybox: cpio hardlink target not sanitized under feature_path_traversal_protection
    25Monitor
  • CVE-2026-12474533 days apartBusybox: tar deferred hardlink target resolved through a deferred symlink escapes the extraction directory
    25Monitor

Not on record for this CVE: patch commit or PR link · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
High
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-59 · Improper Link Resolution Before File Access ('Link Following')

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓
  2. SSVC exploitation— → none
  3. Exploit maturity— → none

For records you follow, these changes also arrive as notifications. →

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records