CVE-2026-53792
rsync < 3.5.0 Out-of-Bounds Read via Zero-Length Checksum Block
Description
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.
INFO
Published Date :
Aug. 13, 2026, 3:19 p.m.
Last Modified :
Nov. 6, 2026, 4 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update rsync to version 3.5.0 or later.
- Apply any available security patches for your rsync installation.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53792.
| URL | Resource |
|---|---|
| https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 | Release Notes |
| https://github.com/RsyncProject/rsync/security/advisories/GHSA-cg57-rp9g-56hw | Vendor Advisory |
| https://www.vulncheck.com/advisories/rsync-out-of-bounds-read-via-zero-length-checksum-block | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53792 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53792
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53792 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53792 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Nov. 06, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:* versions up to (excluding) 3.5.0 Added Reference Type VulnCheck: https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 Types: Release Notes Added Reference Type VulnCheck: https://github.com/RsyncProject/rsync/security/advisories/GHSA-cg57-rp9g-56hw Types: Vendor Advisory Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/rsync-out-of-bounds-read-via-zero-length-checksum-block Types: Third Party Advisory -
CVE Translated by [email protected]
Oct. 24, 2026
Action Type Old Value New Value Changed Translation Title: rsync de RsyncProject, Description: rsync anterior a la versión 3.5.0 contiene una vulnerabilidad de lectura fuera de límites en la lógica de coincidencia de bloques del lado del remitente que permite a un receptor malicioso activar el acceso a la memoria antes del inicio de un búfer asignado al enviar un bloque de suma de verificación manipulado con una longitud de cero. Los atacantes pueden enviar un conjunto de suma de verificación especialmente manipulado que contiene un bloque de longitud cero para causar un cálculo de desplazamiento negativo durante la computación delta, lo que resulta en una lectura fuera de límites de la memoria del búfer de datos del archivo en el lado del remitente. Title: rsync de RsyncProject, Description: rsync anterior a la versión 3.5.0 contiene una vulnerabilidad de lectura fuera de límites en la lógica de coincidencia de bloques del lado del remitente que permite a un receptor malicioso activar el acceso a la memoria antes del inicio de un búfer asignado al enviar un bloque de suma de verificación manipulado con una longitud de cero. Los atacantes pueden enviar un conjunto de suma de verificación especialmente manipulado que contiene un bloque de longitud cero para causar un cálculo de desplazamiento negativo durante la computación delta, lo que resulta en una lectura fuera de límites de la memoria del búfer de datos del archivo en el lado del remitente. -
CVE Translated by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Added Translation Title: rsync de RsyncProject, Description: rsync anterior a la versión 3.5.0 contiene una vulnerabilidad de lectura fuera de límites en la lógica de coincidencia de bloques del lado del remitente que permite a un receptor malicioso activar el acceso a la memoria antes del inicio de un búfer asignado al enviar un bloque de suma de verificación manipulado con una longitud de cero. Los atacantes pueden enviar un conjunto de suma de verificación especialmente manipulado que contiene un bloque de longitud cero para causar un cálculo de desplazamiento negativo durante la computación delta, lo que resulta en una lectura fuera de límites de la memoria del búfer de datos del archivo en el lado del remitente. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 14, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-53792', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-14T15:55:27.241485Z'} -
New CVE Received by [email protected]
Aug. 13, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'RsyncProject', 'product': 'rsync', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'semver', 'lessThanOrEqual': '3.4.4'}, {'status': 'unaffected', 'version': '3.5.0', 'versionType': 'semver'}], 'collectionURL': 'https://github.com/RsyncProject/rsync', 'defaultStatus': 'unaffected'}] Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Added CWE CWE-787 Added CWE CWE-129 Added Reference https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 Added Reference https://github.com/RsyncProject/rsync/security/advisories/GHSA-cg57-rp9g-56hw Added Reference https://www.vulncheck.com/advisories/rsync-out-of-bounds-read-via-zero-length-checksum-block