TI-2026-38788 Aliases CVE-2026-53792

rsync < 3.5.0 Out-of-Bounds Read via Zero-Length Checksum Block

LOW 31CWE-129Published 2026-08-13 · Updated 2026-08-14

Key facts

Attack vector: Network
Privileges required: None
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 8 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-129 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00347 28th percentileScored 2026-11-07

Fix Partial rsync (RsyncProject): 3.5.0Red Hat: 8 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Samba	rsync	up to 3.4.4	3.5.0	Patch available	CNA

rsync VendorSamba Affected up to 3.4.4 Fixed in 3.5.0 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:samba:rsync::::::::	before 3.5.0	Vulnerable	Samba

cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:* Versions before 3.5.0 Vulnerable ·Samba

Remediation

Fix · CNA rsync (RsyncProject) Fixed in 3.5.0

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 6	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 7	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 8	Affected	No fix yet: Fix deferred
Red Hat Enterprise Linux 9	Affected	No fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)	Affected	—
Red Hat OpenShift Container Platform 4	Affected	No fix yet: Fix deferred
Red Hat OpenShift Container Platform 5	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-53792
2026-11-06 Affected versions changed · Red Hat
2026-11-06 Affected versions changed · Red Hat

References

Advisory 1

GitHub Security Advisory (GHSA-cg57-rp9g-56hw)

Other 1

rsync 3.5.0 Release Notes

TI-2024-11208 Rsync: heap buffer overflow in rsync due to improper checksum length handling CVSS 3.1CRITICAL 9.8
TI-2024-11209 Rsync: info leak via uninitialized stack contents CVSS 3.1HIGH 7.5
TI-2024-11212 Rsync: --safe-links option bypass leads to path traversal CVSS 3.1HIGH 7.5
TI-2024-11211 Rsync: path traversal vulnerability in rsync CVSS 3.1HIGH 7.5
TI-2024-11210 Rsync: rsync server leaks arbitrary client files CVSS 3.1MEDIUM 6.8
TI-2017-12160 The receive_xattr function in xattrs.c in rsync 3.1.2 and 3.1.3-development does not… CVSS 3.1CRITICAL 9.8

See all 56 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences