Buffer overflow in Rsyncproject Rsync
CVE-2026-70458
rsync 3.0.0 before 3.5.0 contains an out-of-bounds write vulnerability that allows attackers to corrupt memory by triggering HLINK_BUMP processing on file entries with the FLAG_HLINKED flag set while the hard-link preservation option is inactive. Attackers can exploit the missing F_SUM field in the file_struct layout to access memory past the end of the allocated structure, corrupting adjacent heap or stack data.
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 3.0.0, 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-gg3m-4m9m-268h (vendor-advisory)
- www.vulncheck.com/advisories/rsync-out-of-bounds-write-via-flag-hlinked-handling (third-party-advisory)
Frequently asked questions
- What is CVE-2026-70458?
- CVE-2026-70458 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-2026-70458?
- High severity. CVSS v3 base score is 8.2 out of 10.