Buffer overflow in Rsyncproject Rsync
CVE-2026-70456
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 class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
EPSS: 0.005 (43.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Rsyncproject Rsync — versions 3.0.1, 3.5.0
Weakness classification (CWE)
References
- github.com/RsyncProject/rsync/releases/tag/v3.5.0 (release-notes)
- github.com/RsyncProject/rsync/security/advisories/GHSA-78jc-79jv-v6rw (vendor-advisory)
- www.vulncheck.com/advisories/rsync-heap-out-of-bounds-write-via-read-args (third-party-advisory)
Frequently asked questions
- What is CVE-2026-70456?
- CVE-2026-70456 is a high-severity vulnerability in Rsyncproject Rsync, classified under Out-of-bounds Write. CVSS score: 8.2/10. Published 2026-08-13.
- How severe is CVE-2026-70456?
- High severity. CVSS v3 base score is 8.2 out of 10.