CVE-2026-70461

Description

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.

CVSS breakdown

Affected products

• RsyncProject / rsync3.2.5 – 3.4.4
• RsyncProject / rsync3.5.0 – 3.5.0

References

• VENDOR_ADVISORYhttps://github.com/RsyncProject/rsync/security/advisories/GHSA-jhxm-j4mq-3fj4
• PATCHhttps://github.com/RsyncProject/rsync/releases/tag/v3.5.0
• VENDOR_ADVISORYhttps://www.vulncheck.com/advisories/rsync-heap-out-of-bounds-write-via-files-from-entry