CVE-2026-70457rsync 3.2.3 < 3.5.0 Out-of-Bounds Write via parse_size_arg()
Updated under an hour ago ()
Does this affect you?
It affects RsyncProject rsync and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
rsync 3.2.3 before 3.5.0 contains an out-of-bounds write in parse_size_arg() where the return value of snprintf() is used directly as an index into a .bss-segment array without bounds checking. When snprintf truncates the formatted size string, the return value equals the number of characters that would have been written including the truncated portion, and this value may exceed the array length. The subsequent indexed write targets memory outside the intended array bounds, corrupting .bss memory.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
- Weakness (CWE)
- CWE-131, CWE-787
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Analyzed
- Record last updated
- Aug 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
RsyncProject rsync rsyncproject:rsync (from the name) | from 3.2.3 through 3.4.4; 3.5.0 not affected | CNA record |
samba rsync samba:rsync | from 3.2.3 before 3.5.0 | NVD |
References
- https://github.com/RsyncProject/rsync/security/advisories/GHSA-pg7g-xqmr-xpfhvendor-advisory
- https://github.com/RsyncProject/rsync/releases/tag/v3.5.0release-notes, product
- https://www.vulncheck.com/advisories/rsync-out-of-bounds-write-via-parse-size-argthird-party-advisory, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.