IBM i 7.x Stack Buffer Overflow Culminates in DoS via Remote Attack
CVE-2026-18077 Published on August 13, 2026
IBM 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 due to a stack-based buffer overflow.
Vulnerability Analysis
CVE-2026-18077 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-18077 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-18077
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Affected Versions
IBM i:- Version 7.6 is affected.
- Version 7.5 is affected.
- Version 7.4 is affected.
- Version 7.3 is affected.