[UPDATE] [high] Samba: Multiple vulnerabilities

criticalCVE-2026-1933 CVE-2026-2340 CVE-2026-3012 CVE-2026-3238 CVE-2026-4408 CVE-2026-4480

An attacker can exploit multiple vulnerabilities in Samba to execute arbitrary code, conduct a denial of service attack, manipulate files, and bypass security measures.

CSIRTS triage

vendor: Samba product: Samba Remote code execution Denial of serviceOther

What: Multiple vulnerabilities in Samba allow an attacker to execute arbitrary code, conduct denial of service attacks, manipulate files, and bypass security measures.
Who is affected: Deployments of Samba are affected by these vulnerabilities.
Urgency: Remediation is urgent due to the critical severity of the vulnerabilities, although they are not currently exploited.
Action: Update to the latest version of Samba to mitigate these vulnerabilities.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: critical
Published: 2026-08-20
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1686

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-19330.86% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 56% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-23400.94% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 58% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-30120.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2026-32382.7% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 85% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2026-44082.5% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 83% of all EPSS-scored CVEs.
Elevated exploitation riskCVE-2026-448013.9% 30-day exploitation probability — well above the norm. Schedule remediation this cycle. Riskier than 96% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-1933	coverage & exploitation status	NVD · CVE.org
CVE-2026-2340	coverage & exploitation status	NVD · CVE.org
CVE-2026-3012	coverage & exploitation status	NVD · CVE.org
CVE-2026-3238	coverage & exploitation status	NVD · CVE.org
CVE-2026-4408	coverage & exploitation status	NVD · CVE.org
CVE-2026-4480	coverage & exploitation status	NVD · CVE.org

Recent advisories for Samba

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[NEW] [high] Samba: Multiple vulnerabilitiescert-bund · 2026-08-17
medium[NEW] [UNPATCHED] [medium] Samba: Vulnerability allows Denial of Servicecert-bund · 2026-08-17
mediumCVE-2026-58224: A flaw was found in Samba's CTDB, the clustered database service used by Samba. Insufficient i…nvd · 2026-08-14
highCVE-2026-58222: A security flaw combining LDAP filter injection and improper authorization checks was found in…nvd · 2026-07-30
mediumCVE-2026-58216: An out-of-bounds read flaw was found in Samba's Kerberos Key Distribution Center's (KDC) passw…nvd · 2026-07-30
mediumCVE-2026-58218: A flaw was found in Samba's internal DNS server where unauthenticated TKEY registration reques…nvd · 2026-07-30