CVE-2026-16815IBM i is Affected By Multiple Vulnerabilities in Simple Mail Transfer Protocol

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to cause a denial of service and potentially obtain sensitive information due to a stack-based buffer overflow.

9.1 CRITICALEPSS 0.45%Not in KEVNVD: Undergoing Analysis

Last updated: 2026-08-17 14:53 UTC

OverviewCVSS details

9.1CRITICALCVSS 3.1

Score source: NVD
NVD status: Undergoing Analysis
Published: Aug 13, 2026
Assigner: ibm

Affected

i (IBM)

Versions: 7.6 · 7.5

All affected versions →

Exploitation

Public exploit: None listed
CISA KEV: Not listed
KEV due date: —
SSVC: Exploitation none · Automatable yes · Impact partial

EPSS · FIRST, scored Nov 7

0.45%chance of exploitation in 30 days

Higher than 39.70% of CVEs

CVSS 3.1 · NVD

9.1Critical

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: None
Availability impact: High

CVSS 3.1 · ibm (CNA)

8.6High

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

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: Low
Integrity impact: Low
Availability impact: High

NVD status: Undergoing Analysis

Overview Affected Products References

NVD CVE.org

Overview

Severity

Score	Severity	Version	Vector String
9.1	CRITICAL	3.1NVD	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
8.6	HIGH	3.1ibm (CNA)	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H

Details

CVE ID: CVE-2026-16815
Status: Undergoing Analysis
Assigner (CNA): ibm
Published: Aug 13, 2026
Last modified: 2026-08-17 14:53 UTC
Weaknesses: CWE-787 · Out-of-bounds Write

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 11:18 UTC.