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CVE Record

CVE-2026-4480: Samba: samba: remote code execution in printing subsystem via unescaped job description

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.

CriticalCVSS 9Not KEV-listedUpdated
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Glexia's TakeAutomated analysiscritical

Security readout for executives and security teams

Plain-English summary

CVE-2026-4480 is a critical Samba printing flaw where a remote user can place shell metacharacters in a print job description. On affected Red Hat systems, this can lead to remote code execution when the configured print command uses the vulnerable job-description substitution.

Executive priority

Prioritize remediation as critical where Samba printing is enabled. The business risk is remote command execution on file or print infrastructure, which can affect confidentiality, integrity, and availability. Lack of confirmed exploitation reduces emergency certainty, not technical severity.

Technical view

Samba passes the client-controlled print job description into the configured print command through the %J substitution without escaping shell metacharacters. Red Hat maps this to CWE-78 with CVSS 3.1 score 9.0. Listed affected packages include samba builds across RHEL 7 ELS, 8, 9, 10, and selected EUS/AUS/TUS/E4S streams.

Likely exposure

Exposure is most likely on Red Hat systems running affected samba packages with Samba printing enabled and print command behavior using %J. OpenShift Container Platform 4 rhcos is listed as unaffected. RHEL 6 samba and samba4 status is listed as unknown in the provided data.

Exploitation context

The provided sources describe unauthenticated remote exploitation potential, but high attack complexity. KEV is false, and no cited source in the bundle confirms active exploitation. Treat internet- or broadly network-reachable Samba printing services as higher priority.

Researcher notes

The key condition is shell injection through %J in print command handling. Avoid assuming impact for unlisted distributions or configurations. Validate exposure by package, RHEL lifecycle stream, Samba printing configuration, and whether print jobs can be submitted remotely.

Mitigation direction

  • Apply the applicable Red Hat RHSA update for each affected RHEL stream.
  • Inventory samba package versions against the affected package list.
  • Check Red Hat and Samba guidance for supported workarounds if patching is delayed.
  • Reduce unnecessary network exposure to Samba printing services.
  • Prioritize systems where Samba accepts print jobs from untrusted networks.

Validation and detection

  • Confirm installed samba package versions on all RHEL hosts.
  • Review Samba configuration for printing and print command usage.
  • Verify each host maps to a fixed Red Hat advisory package.
  • Check asset inventory for RHEL 7 ELS, 8, 9, 10, and extended streams.
  • Document RHEL 6 status as unknown pending vendor confirmation.
Prepared
Confidence
high
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-78: Command execution behavior lookup

Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Execution behavior lookup

The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-4480 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Critical
CVSS
9 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
7Timeline events
2ADP providers
16Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
9CVSS 3.1CriticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H2.26redhat
9CVSS 3.1CriticalCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H2.26redhat-SADP

Vulnerability scoring details

Base CVSS 3.1 score

9Critical
CVSS 3.1 vector shape for CVE-2026-4480Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Reported to Red Hat.

  3. Source timelineredhat

    Reported to Red Hat.

  4. ADP timelineredhat-SADP

    Made public.

  5. Source timelineredhat

    Made public.

  6. CVE publishedCVE Program

    The CVE record was published.

  7. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPsamba: Samba: Remote Code Execution in printing subsystem via unescaped job description
other:Red Hat severity ratingcvssV3_1
  • 2026-03-27T13:35:42.879Z: Reported to Red Hat.
  • 2026-05-26T13:43:46.237Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Red HatRed Hat Enterprise Linux 10samba, 0:4.23.5-109.el10_2affected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Supportsamba, 0:4.21.3-114.el10_0.1affected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Supportsamba, 0:4.10.16-26.el7_9.1affected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Supportsamba, 0:4.10.16-26.el7_9.1affected
Red HatRed Hat Enterprise Linux 8samba, 0:4.19.4-16.el8_10affected
Red HatRed Hat Enterprise Linux 8samba, 0:4.19.4-16.el8_10affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportsamba, 0:4.13.3-12.el8_4.1affected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onsamba, 0:4.13.3-12.el8_4.1affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportsamba, 0:4.15.5-16.el8_6.1affected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-Onsamba, 0:4.15.5-16.el8_6.1affected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Servicesamba, 0:4.17.5-7.el8_8.1affected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutionssamba, 0:4.17.5-7.el8_8.1affected
Red HatRed Hat Enterprise Linux 9samba, 0:4.23.5-10.el9_8affected
Red HatRed Hat Enterprise Linux 9samba, 0:4.23.5-10.el9_8affected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutionssamba, 0:4.17.5-105.el9_2.5affected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutionssamba, 0:4.19.4-105.el9_4.4affected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Supportsamba, 0:4.21.3-14.el9_6.1affected
Red HatRed Hat Enterprise Linux 6sambaunknown
Red HatRed Hat Enterprise Linux 6samba4unknown
Red HatRed Hat OpenShift Container Platform 4rhcosunaffected
Weakness

CWE details

CWE-78

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.