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SMTP Implementation CVE-2026-57229

MEDIUM
2026-09-14 vendor:ubuntu
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Severity by source

vuln.today AI
5.9 MEDIUM

Network vector (SMTP is a network protocol), high complexity (specific command sequence required), no privileges needed, integrity-only impact via security control evasion.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Estimated by vuln.today — no official severity rating has been published for this CVE yet.

Lifecycle Timeline

2
Analysis Generated
Sep 14, 2026 - 09:09 vuln.today
CVE Published
Sep 14, 2026 - 00:00 cve.org
MEDIUM

DescriptionCVE.org

[smtp: evasion due to incomplete state reset]

AnalysisAI

SMTP evasion via incomplete state reset in an Ubuntu-reported component allows an attacker to bypass protocol-level security controls by exploiting improper state machine cleanup between SMTP sessions or command sequences. The vulnerability enables crafted SMTP interactions to carry over state from a prior transaction into a new one, potentially allowing filter evasion, spoofed sender identity acceptance, or bypass of per-message security checks. …

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Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The specific exploitation conditions are not confirmed from available data. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Real-world risk assessment is severely constrained by the near-total absence of structured metadata: no CVSS vector, no CWE, no EPSS score, no KEV listing, and no POC status are available. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patch version has been identified in the available data. … Detailed patch versions, workarounds, and compensating controls in full report.

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CVE-2026-57229 vulnerability details – vuln.today

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