CVE-2026-4480
CriticalExploitedSamba 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.
Published May 26, 2026 · Updated Sep 2, 2026 · Also known as ALPINE-CVE-2026-4480, DEBIAN-CVE-2026-4480, EUVD-2026-31828, GHSA-hwwh-4hhw-h9jf, UBUNTU-CVE-2026-4480, USN-8306-1
Key Facts
Patch immediately- CVE-2026-4480 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Openshift Container Platform (Redhat), Samba, Enterprise Linux (Redhat) and 22 more products.
- It is exploited in the wild, listed in Industry KEV feed since Jul 20, 2026. No public exploit code is known.
- EPSS estimates a 14% probability of exploitation in the next 30 days.
- Fixed versions are available, including ctdb 2:4.15.13+dfsg-0ubuntu1.12, ctdb 2:4.19.5+dfsg-4ubuntu9.6, ctdb 2:4.22.3+dfsg-4ubuntu2.4.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
14%
Exploited in the wild
Yes
1 catalog listing
Public exploit code
None known
Get the full CVE-2026-4480 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Jul 20, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
836 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Openshift Container PlatformRedhat | 4.0 | n/a |
| SambaSamba | See advisory | 4.2.1 |
| Enterprise LinuxRedhat | 10.0, 7.0, 8.0, 9.0 | n/a |
| 8Enterprise Linux | See advisory | n/a |
| 9Enterprise Linux | See advisory | n/a |
Patched Releases
ctdb
2:4.15.13+dfsg-0ubuntu1.12, 2:4.19.5+dfsg-4ubuntu9.6, 2:4.22.3+dfsg-4ubuntu2.4, 2:4.23.6+dfsg-1ubuntu2.1, 4.10.16-24.amzn2.0.7, 4.10.16-25.0.11.el7_9, 4.15.13+git.701.449cb7f5cd3-3.106.1, 4.15.13+git.780.d2f53cbcded-150300.3.103.1, 4.15.13+git.780.d2f53cbcded-150400.3.49.1, 4.17.12+git.553.4b71189e782-150500.3.39.1, 4.19.4-16.0.1.el8_10, 4.19.8+git.473.51d12fd320c-150600.3.26.1, 4.21.10+git.501.277ba349a01-150700.3.26.1, 4.22.11+git.552.66cfeb7de0a-160000.1.1, 4.22.9+git.506.22c03ce0781-160000.1.1, 4.23.8+git.477.f78166bceed-1.1
ctdb-pcp-pmda
4.19.8+git.473.51d12fd320c-150600.3.26.1, 4.22.11+git.552.66cfeb7de0a-160000.1.1, 4.22.9+git.506.22c03ce0781-160000.1.1, 4.23.8+git.477.f78166bceed-1.1
ctdb-tests
4.10.16-24.amzn2.0.7, 4.10.16-25.0.11.el7_9
ldb-tools
2:2.11.0+samba4.22.3+dfsg-4ubuntu2.4, 2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1, 2:2.8.0+samba4.19.5+dfsg-4ubuntu9.6, 4.21.10+git.501.277ba349a01-150700.3.26.1, 4.22.11+git.552.66cfeb7de0a-160000.1.1, 4.22.9+git.506.22c03ce0781-160000.1.1, 4.23.5-10.el9_8, 4.23.5-109.el10_2, 4.23.8+git.477.f78166bceed-1.1
libldb
4.23.5-10.el9_8, 4.23.5-109.el10_2
libldb-dev
2:2.11.0+samba4.22.3+dfsg-4ubuntu2.4, 2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1, 2:2.8.0+samba4.19.5+dfsg-4ubuntu9.6
libldb-devel
4.21.10+git.501.277ba349a01-150700.3.26.1, 4.22.11+git.552.66cfeb7de0a-160000.1.1, 4.22.9+git.506.22c03ce0781-160000.1.1, 4.23.5-10.el9_8, 4.23.5-109.el10_2, 4.23.8+git.477.f78166bceed-1.1
libldb2
2:2.11.0+samba4.22.3+dfsg-4ubuntu2.4, 2:2.11.0+samba4.23.6+dfsg-1ubuntu2.1, 2:2.8.0+samba4.19.5+dfsg-4ubuntu9.6, 4.21.10+git.501.277ba349a01-150700.3.26.1, 4.22.11+git.552.66cfeb7de0a-160000.1.1, 4.22.9+git.506.22c03ce0781-160000.1.1, 4.23.8+git.477.f78166bceed-1.1
libldb2-32bit
4.21.10+git.501.277ba349a01-150700.3.26.1, 4.23.8+git.477.f78166bceed-1.1
libnetapi
2:4.17.12-1.amzn2023.0.4, 4.19.4-16.0.1.el8_10, 4.23.5-10.el9_8, 4.23.5-109.el10_2
libnetapi-devel
2:4.17.12-1.amzn2023.0.4, 4.19.4-16.0.1.el8_10, 4.23.5-10.el9_8, 4.23.5-109.el10_2
libnss-winbind
2:4.15.13+dfsg-0ubuntu1.12, 2:4.19.5+dfsg-4ubuntu9.6, 2:4.22.3+dfsg-4ubuntu2.4, 2:4.23.6+dfsg-1ubuntu2.1
libpam-winbind
2:4.15.13+dfsg-0ubuntu1.12, 2:4.19.5+dfsg-4ubuntu9.6, 2:4.22.3+dfsg-4ubuntu2.4, 2:4.23.6+dfsg-1ubuntu2.1
libsamba-policy-devel
4.15.13+git.701.449cb7f5cd3-3.106.1, 4.15.13+git.780.d2f53cbcded-150400.3.49.1, 4.17.12+git.553.4b71189e782-150500.3.39.1, 4.19.8+git.473.51d12fd320c-150600.3.26.1
libsamba-policy-python3-devel
4.15.13+git.701.449cb7f5cd3-3.106.1, 4.15.13+git.780.d2f53cbcded-150400.3.49.1, 4.17.12+git.553.4b71189e782-150500.3.39.1, 4.19.8+git.473.51d12fd320c-150600.3.26.1
libsamba-policy0-python3
4.15.13+git.701.449cb7f5cd3-3.106.1, 4.15.13+git.780.d2f53cbcded-150400.3.49.1, 4.17.12+git.553.4b71189e782-150500.3.39.1, 4.19.8+git.473.51d12fd320c-150600.3.26.1
libsamba-policy0-python3-32bit
4.15.13+git.701.449cb7f5cd3-3.106.1, 4.19.8+git.473.51d12fd320c-150600.3.26.1
libsmbclient
2:4.15.13+dfsg-0ubuntu1.12, 2:4.17.12-1.amzn2023.0.4, 4.10.16-24.amzn2.0.7, 4.10.16-25.0.11.el7_9, 4.19.4-16.0.1.el8_10, 4.23.5-10.el9_8, 4.23.5-109.el10_2
libsmbclient-dev
2:4.15.13+dfsg-0ubuntu1.12, 2:4.19.5+dfsg-4ubuntu9.6, 2:4.22.3+dfsg-4ubuntu2.4, 2:4.23.6+dfsg-1ubuntu2.1
libsmbclient-devel
2:4.17.12-1.amzn2023.0.4, 4.10.16-24.amzn2.0.7, 4.10.16-25.0.11.el7_9, 4.19.4-16.0.1.el8_10, 4.23.5-10.el9_8, 4.23.5-109.el10_2
libsmbclient0
2:4.19.5+dfsg-4ubuntu9.6, 2:4.22.3+dfsg-4ubuntu2.4, 2:4.23.6+dfsg-1ubuntu2.1
libtalloc-dev
2:2.4.3+samba4.22.3+dfsg-4ubuntu2.4, 2:2.4.3+samba4.23.6+dfsg-1ubuntu2.1
libtalloc2
2:2.4.3+samba4.22.3+dfsg-4ubuntu2.4, 2:2.4.3+samba4.23.6+dfsg-1ubuntu2.1
libtdb-dev
2:1.4.13+samba4.22.3+dfsg-4ubuntu2.4, 2:1.4.14+samba4.23.6+dfsg-1ubuntu2.1
libtdb1
2:1.4.13+samba4.22.3+dfsg-4ubuntu2.4, 2:1.4.14+samba4.23.6+dfsg-1ubuntu2.1
Timeline
Publicly disclosed
May 26, 2026
Added to Industry KEV feed
Jul 20, 2026
Last updated
Sep 2, 2026
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4480.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-4480
- advisoryhttps://security.alpinelinux.org/vuln/CVE-2026-4480
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2026-4480
- advisoryhttps://ubuntu.com/security/CVE-2026-4480
FAQ
Common Questions.
A flaw was found in the Samba printing subsystem.
Affected: Openshift Container Platform (Redhat) versions 4.0; Samba; Enterprise Linux (Redhat) versions 10.0, 7.0, 8.0, 9.0, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Jul 20, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including ctdb 2:4.15.13+dfsg-0ubuntu1.12, ctdb 2:4.19.5+dfsg-4ubuntu9.6, ctdb 2:4.22.3+dfsg-4ubuntu2.4.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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