CVE-2026-4480

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 13.9%, top 4% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this weekElevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 14%CVSS: 9.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
14%
EPSS %ILE
96%
KEV
Not listed

Published

May 26, 2026

Last Modified

August 24, 2026

Advisory Details (13)

Auto-updated Aug 24, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support

https://access.redhat.com/errata/RHSA-2026:28058
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support

https://access.redhat.com/errata/RHSA-2026:28057
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Serv

https://access.redhat.com/errata/RHSA-2026:28056
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.0 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:28055
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:28054
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.

https://access.redhat.com/errata/RHSA-2026:28053
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.6 Extended Update Support.

https://access.redhat.com/errata/RHSA-2026:25979
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:25049
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:22963
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:22644
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-4480
generic

16033 – (CVE-2026-4480) CVE-2026-4480 [SECURITY] Unauthenticated Remote Code Execution

https://bugzilla.samba.org/show_bug.cgi?id=16033
redhat Patch Available

2452232 – (CVE-2026-4480) CVE-2026-4480 samba: Samba: Remote Code Execution in printing subsystem via unescaped job description

Affected: Red Hat Enterprise Linux 8

https://bugzilla.redhat.com/show_bug.cgi?id=2452232

Vendor Advisories for CVE-2026-4480(12)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(12)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuwinbind (2:4.23.6+dfsg-1ubuntu2.1) @ resolute2026-08-24ubuntu
redhatsamba-0:4.17.5-7.el8_8.12026-06-23redhat
redhatsamba-0:4.17.5-105.el9_2.52026-06-23redhat
redhatsamba-0:4.15.5-16.el8_6.12026-06-23redhat
redhatsamba-0:4.13.3-12.el8_4.12026-06-23redhat
redhatsamba-0:4.21.3-114.el10_0.12026-06-23redhat
redhatsamba-0:4.10.16-26.el7_9.12026-06-23redhat
redhatsamba-0:4.19.4-105.el9_4.42026-06-23redhat
redhatsamba-0:4.21.3-14.el9_6.12026-06-15redhat
redhatsamba-0:4.23.5-10.el9_82026-06-10redhat
redhatsamba-0:4.23.5-109.el10_22026-06-03redhat
redhatsamba-0:4.19.4-16.el8_102026-06-03redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 6 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
samba—4.22.10-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
samba—4.23.8-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
samba2:4.13.13+dfsg-1~deb11u1 ... 2:4.13.5+dfsg-2 (8 versions)2:4.13.13+dfsg-1~deb11u8—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
samba2:4.17.10+dfsg-0+deb12u1 ... 2:4.17.9+dfsg-0+deb12u3~bpo11+1 (13 versions)2:4.17.12+dfsg-0+deb12u4—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
samba2:4.22.3+dfsg-4 ... 2:4.22.8+dfsg-0+deb13u1 (7 versions)2:4.22.8+dfsg-0+deb13u2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
samba2:4.22.3+dfsg-4 ... 2:4.24.3+dfsg-1~bpo13+1 (30 versions)2:4.24.3+dfsg-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 13× in last 7d / 198× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 397 total refreshes for this CVE.

  1. 2026-08-30 19:17 UTCEPSS rescore
  2. 2026-08-30 01:22 UTCEPSS rescore
  3. 2026-08-28 21:41 UTCEPSS rescore
  4. 2026-08-27 14:25 UTCEPSS rescore
  5. 2026-08-26 14:46 UTCEPSS rescore
  6. 2026-08-25 13:49 UTCEPSS rescore
  7. 2026-08-24 13:29 UTCVendor advisory
  8. 2026-08-24 13:29 UTCGHSA enrichment
  9. 2026-08-24 12:24 UTCEG score recompute
  10. 2026-08-24 12:24 UTCVendor advisory
  11. 2026-08-24 12:24 UTCGHSA enrichment
  12. 2026-08-24 00:47 UTCVendor advisory
  13. 2026-08-24 00:47 UTCGHSA enrichment
  14. 2026-08-23 20:30 UTCVendor advisory
  15. 2026-08-23 20:30 UTCGHSA enrichment
  16. 2026-08-23 16:21 UTCEG score recompute
  17. 2026-08-23 16:21 UTCVendor advisory
  18. 2026-08-23 16:21 UTCGHSA enrichment
  19. 2026-08-23 00:19 UTCEPSS rescore
  20. 2026-08-22 01:37 UTCEG score recompute
  21. 2026-08-22 01:37 UTCVendor advisory
  22. 2026-08-22 01:37 UTCGHSA enrichment
  23. 2026-08-21 23:49 UTCEPSS rescore
  24. 2026-08-21 21:28 UTCVendor advisory
  25. 2026-08-21 21:28 UTCGHSA enrichment
Show 75 more
  1. 2026-08-21 13:19 UTCVendor advisory
  2. 2026-08-21 13:19 UTCGHSA enrichment
  3. 2026-08-21 12:31 UTCEG score recompute
  4. 2026-08-21 12:31 UTCVendor advisory
  5. 2026-08-21 12:31 UTCGHSA enrichment
  6. 2026-08-20 22:55 UTCEPSS rescore
  7. 2026-08-20 22:42 UTCVendor advisory
  8. 2026-08-20 22:42 UTCGHSA enrichment
  9. 2026-08-20 18:15 UTCEG score recompute
  10. 2026-08-20 18:15 UTCVendor advisory
  11. 2026-08-20 18:15 UTCGHSA enrichment
  12. 2026-08-19 17:04 UTCEPSS rescore
  13. 2026-08-18 13:48 UTCEPSS rescore
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 13:41 UTCVendor advisory
  16. 2026-08-17 13:41 UTCGHSA enrichment
  17. 2026-08-17 09:33 UTCVendor advisory
  18. 2026-08-17 09:33 UTCGHSA enrichment
  19. 2026-08-16 16:32 UTCEG score recompute
  20. 2026-08-16 16:32 UTCVendor advisory
  21. 2026-08-16 16:32 UTCGHSA enrichment
  22. 2026-08-16 14:56 UTCEPSS rescore
  23. 2026-08-16 11:21 UTCVendor advisory
  24. 2026-08-16 11:21 UTCGHSA enrichment
  25. 2026-08-16 07:14 UTCVendor advisory
  26. 2026-08-16 07:14 UTCGHSA enrichment
  27. 2026-08-16 03:06 UTCEG score recompute
  28. 2026-08-16 03:06 UTCVendor advisory
  29. 2026-08-16 03:06 UTCGHSA enrichment
  30. 2026-08-16 02:14 UTCEPSS rescore
  31. 2026-08-15 03:00 UTCEG score recompute
  32. 2026-08-15 03:00 UTCVendor advisory
  33. 2026-08-15 03:00 UTCGHSA enrichment
  34. 2026-08-15 01:30 UTCEPSS rescore
  35. 2026-08-14 22:23 UTCVendor advisory
  36. 2026-08-14 22:23 UTCGHSA enrichment
  37. 2026-08-14 18:15 UTCVendor advisory
  38. 2026-08-14 18:15 UTCGHSA enrichment
  39. 2026-08-14 14:07 UTCVendor advisory
  40. 2026-08-14 14:07 UTCGHSA enrichment
  41. 2026-08-14 09:59 UTCVendor advisory
  42. 2026-08-14 09:59 UTCGHSA enrichment
  43. 2026-08-14 05:51 UTCVendor advisory
  44. 2026-08-14 05:51 UTCGHSA enrichment
  45. 2026-08-14 01:43 UTCEG score recompute
  46. 2026-08-14 01:43 UTCVendor advisory
  47. 2026-08-14 01:43 UTCGHSA enrichment
  48. 2026-08-13 22:00 UTCEPSS rescore
  49. 2026-08-13 10:43 UTCVendor advisory
  50. 2026-08-13 10:43 UTCGHSA enrichment
  51. 2026-08-13 06:34 UTCVendor advisory
  52. 2026-08-13 06:34 UTCGHSA enrichment
  53. 2026-08-13 02:25 UTCVendor advisory
  54. 2026-08-13 02:25 UTCGHSA enrichment
  55. 2026-08-12 22:18 UTCVendor advisory
  56. 2026-08-12 22:18 UTCGHSA enrichment
  57. 2026-08-12 18:10 UTCVendor advisory
  58. 2026-08-12 18:10 UTCGHSA enrichment
  59. 2026-08-12 13:58 UTCEG score recompute
  60. 2026-08-12 13:58 UTCVendor advisory
  61. 2026-08-12 13:58 UTCGHSA enrichment
  62. 2026-08-12 13:51 UTCEPSS rescore
  63. 2026-08-12 09:41 UTCVendor advisory
  64. 2026-08-12 09:41 UTCGHSA enrichment
  65. 2026-08-12 03:04 UTCVendor advisory
  66. 2026-08-12 03:04 UTCGHSA enrichment
  67. 2026-08-11 22:53 UTCVendor advisory
  68. 2026-08-11 22:53 UTCGHSA enrichment
  69. 2026-08-11 18:34 UTCEG score recompute
  70. 2026-08-11 18:34 UTCVendor advisory
  71. 2026-08-11 18:34 UTCGHSA enrichment
  72. 2026-08-11 13:41 UTCVendor advisory
  73. 2026-08-11 13:41 UTCGHSA enrichment
  74. 2026-08-11 08:38 UTCVendor advisory
  75. 2026-08-11 08:38 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCTheCyberGeek/CVE-2026-4480-PoC
    First seen Jun 5, 2026
    Open source ↗
  • Nucleijavascript/cves/2026/CVE-2026-4480.yaml
    First seen Jan 1, 2026

    Samba Printing Subsystem - Remote Code Execution

    Open source ↗

Frequently asked(5)

What is CVE-2026-4480?
CVE-2026-4480 is a critical vulnerability published on May 26, 2026. 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…
When was CVE-2026-4480 disclosed?
CVE-2026-4480 was first published in the National Vulnerability Database on May 26, 2026, with the most recent update on August 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-4480 actively exploited?
CVE-2026-4480 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 14% probability of exploitation in the next 30 days, which ranks it in the top 3.7% of all scored CVEs.
What is the CVSS score of CVE-2026-4480?
CVE-2026-4480 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-4480?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4480, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-4480

Explore →

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