CVE-2026-4480: Samba: samba: remote code execution in printing subsystem via unescaped job description
Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.
Generated by VEDAS. Scores as of 2026-11-11 15:49 UTC. Rebuilt every few hours from cve-scores, CISA KEV and vedas-signatures. How this works and its limits.
What it is
A flaw was found in the Samba printing subsystem. Samba passes the client-controlled job description string to the command configured with the “print command” setting via the “%J” substitution character without escaping shell meta characters. A remote attacker could exploit this vulnerability by sending a specially crafted print job description that contains unescaped shell characters. This could lead to remote code execution on the affected system.
Description quoted from the CVE record (assigned by redhat, published 2026-05-26).
Weakness: Improper Neutralization of Special Elements used in an OS Command; Improper Neutralization of Special Elements used in an OS Command (‘OS Command Injection’)
How it can be exploited
Exploitable over the network with high attack complexity needing no privileges and no user interaction. Impact: confidentiality high, integrity high, availability high. CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA assessment (SSVC): CISA has no evidence of exploitation. Automatable: no. Technical impact: total.
Public exploit evidence (Exploit Observer)
Exploit Observer found 1 Nuclei template, 9 code repositories and 2 research write-ups naming this CVE.
Code repositories that name a CVE are often scanners, copies or fakes, and some are malware. Read the code before running anything.
See all 23 references on Exploit Observer
Live scores
- EPSS
- 0.287
likely to be attacked soon - VEDAS
- 0.914
strong exploit evidence - On CISA KEV
- Not listed
- Detection rule
- No public rule yet
Who is affected
| Product | Affected | Not affected |
|---|---|---|
| Red Hat Enterprise Linux 10 (samba) | Not stated | 0:4.23.5-109.el10_2 is not affected (up to *) |
| Red Hat Enterprise Linux 10.0 Extended Update Support (samba) | Not stated | 0:4.21.3-114.el10_0.1 is not affected (up to *) |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support (samba) | Not stated | 0:4.10.16-26.el7_9.1 is not affected (up to *) |
| Red Hat Enterprise Linux 7 Extended Lifecycle Support (samba) | Not stated | 0:4.10.16-26.el7_9.1 is not affected (up to *) |
| Red Hat Enterprise Linux 8 (samba) | Not stated | 0:4.19.4-16.el8_10 is not affected (up to *) |
| Red Hat Enterprise Linux 8 (samba) | Not stated | 0:4.19.4-16.el8_10 is not affected (up to *) |
| Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support (samba) | Not stated | 0:4.13.3-12.el8_4.1 is not affected (up to *) |
| Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On (samba) | Not stated | 0:4.13.3-12.el8_4.1 is not affected (up to *) |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (samba) | Not stated | 0:4.15.5-16.el8_6.1 is not affected (up to *) |
| Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (samba) | Not stated | 0:4.15.5-16.el8_6.1 is not affected (up to *) |
| Red Hat Enterprise Linux 8.8 Telecommunications Update Service (samba) | Not stated | 0:4.17.5-7.el8_8.1 is not affected (up to *) |
| Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (samba) | Not stated | 0:4.17.5-7.el8_8.1 is not affected (up to *) |
| Red Hat Enterprise Linux 9 (samba) | Not stated | 0:4.23.5-10.el9_8 is not affected (up to *) |
| Red Hat Enterprise Linux 9 (samba) | Not stated | 0:4.23.5-10.el9_8 is not affected (up to *) |
| Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (samba) | Not stated | 0:4.17.5-105.el9_2.5 is not affected (up to *) |
| Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions (samba) | Not stated | 0:4.19.4-105.el9_4.4 is not affected (up to *) |
| Red Hat Enterprise Linux 9.6 Extended Update Support (samba) | Not stated | 0:4.21.3-14.el9_6.1 is not affected (up to *) |
| Red Hat Enterprise Linux 6 (samba) | Not stated | Not stated |
| Red Hat Enterprise Linux 6 (samba4) | Not stated | Not stated |
| Red Hat OpenShift Container Platform 4 (openshift/ose-rhel-coreos-8) | Not stated | Not stated |
1 more products are listed in the CVE record.
Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.
How to fix it
Vendor guidance:
- RHSA-2026:22644 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:22963 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:25049 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:25979 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:28053 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:28054 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:28055 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:28056 (vendor-advisory, x_refsource_REDHAT)
3 more
- RHSA-2026:28057 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:28058 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:28132 (vendor-advisory, x_refsource_REDHAT)
How to detect it
There is no open VEDAS detection rule for this bug yet. It is listed on the detection gaps page if CISA has confirmed attacks.
References
Vendor advisories and patches
- RHSA-2026:22644 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:22963 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:25049 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:25979 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:28053 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:28054 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:28055 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:28056 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:28057 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:28058 (vendor-advisory, x_refsource_REDHAT)
- RHSA-2026:28132 (vendor-advisory, x_refsource_REDHAT)
Technical analysis and advisories
- RHBZ#2452232 (issue-tracking, x_refsource_REDHAT)
Other references
- https://access.redhat.com/security/cve/CVE-2026-4480 (vdb-entry, x_refsource_REDHAT)
- https://bugzilla.samba.org/show_bug.cgi?id=16033
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-4480.json (x_sadp-csaf-vex)
Other databases
Where this comes from
This advisory is generated automatically by VEDAS from: CVE.org record, cve-scores (EPSS and VEDAS), Exploit Observer. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.
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