Rsync 3.2.53.4.9: Heap OOB Write via files-from
CVE-2026-70461 Published on August 13, 2026
rsync 3.2.5 < 3.5.0 Heap Out-of-Bounds Write via files-from Entry
rsync 3.2.5 before 3.5.0 contains a heap out-of-bounds write vulnerability that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of a heap allocation by supplying a crafted files-from entry. Attackers can trigger the vulnerability against a read-only rsync daemon module by providing a files-from entry containing both an interior and trailing backslash, causing the add_implied_include() function to under-count the trailing backslash when sizing the destination buffer.
Vulnerability Analysis
CVE-2026-70461 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 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-2026-70461 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-70461
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Affected Versions
RsyncProject rsync:- Version 3.2.5, <= 3.4.4 is affected.
- Version 3.5.0 is unaffected.