rsync OOB Write in read_args() 3.0.1<3.5.0
CVE-2026-70456 Published on August 13, 2026
rsync 3.0.1 < 3.5.0 Heap Out-of-Bounds Write via read_args()
rsync 3.0.1 before 3.5.0 contains an out-of-bounds write vulnerability in the read_args() function that allows a malicious sender to corrupt adjacent heap memory by sending a crafted argument list. When the argument count causes the argv allocation to be exactly full, the trailing NULL terminator is written one slot beyond the allocation boundary, corrupting adjacent heap memory.
Vulnerability Analysis
CVE-2026-70456 is exploitable 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 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-2026-70456 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-70456
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Affected Versions
RsyncProject rsync:- Version 3.0.1, <= 3.4.4 is affected.
- Version 3.5.0 is unaffected.