CVE-2026-53792rsync < 3.5.0 Out-of-Bounds Read via Zero-Length Checksum Block
Updated under an hour ago ()
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It affects RsyncProject rsync. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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rsync before 3.5.0 contains an out-of-bounds read vulnerability in the sender-side block matching logic that allows a malicious receiver to trigger memory access before the start of an allocated buffer by sending a crafted checksum block with a length of zero. Attackers can send a specially crafted checksum set containing a zero-length block to cause a negative offset calculation during delta computation, resulting in an out-of-bounds read of file data buffer memory on the sender side.
- CVSS
- 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-129, 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
- Undergoing Analysis
- Record last updated
- Aug 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
RsyncProject rsync rsyncproject:rsync (from the name) | through 3.4.4; 3.5.0 not affected | CNA record |
References
- https://github.com/RsyncProject/rsync/security/advisories/GHSA-cg57-rp9g-56hwvendor-advisory
- https://github.com/RsyncProject/rsync/releases/tag/v3.5.0release-notes
- https://www.vulncheck.com/advisories/rsync-out-of-bounds-read-via-zero-length-checksum-blockthird-party-advisory
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.