Exim <4.100.1 OOB Write via Proxy-Protocol (attacker-controlled IP)
CVE-2026-94054 Published on September 19, 2026
Exim before 4.100.1, when Proxy-Protocol is used with an attacker-controlled proxy, has an out-of-bounds write.
Vulnerability Analysis
CVE-2026-94054 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a high impact on integrity, and a small 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-2026-94054 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-94054
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Affected Versions
Exim:- Version 4.83 and below 4.100.1 is affected.