CVE-2026-70464
rsync 2.0.0 < 3.5.0 Connection Slot Exhaustion DoS via Handshake Stall
Description
rsync daemon 2.0.0 before 3.5.0 contains a denial of service vulnerability that allows unauthenticated remote attackers to exhaust daemon connection slots by stalling the handshake process before or after module selection without triggering the I/O timeout. Attackers can open many simultaneous connections and trickle data at the minimum rate to avoid timeout, or stall entirely before module selection where no timeout applies, consuming all available connection slots and denying service to legitimate clients.
INFO
Published Date :
Aug. 13, 2026, 3:20 p.m.
Last Modified :
Oct. 24, 2026, 3:10 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 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | 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.
- Configure connection limits and timeouts.
- Monitor network traffic for suspicious patterns.
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-2026-70464.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-70464 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-2026-70464
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-2026-70464 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-70464 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.
-
CVE Translated by [email protected]
Oct. 24, 2026
Action Type Old Value New Value Changed Translation Title: rsync de RsyncProject, Description: El demonio rsync 2.0.0 anterior a 3.5.0 contiene una vulnerabilidad de denegación de servicio que permite a atacantes remotos no autenticados agotar las ranuras de conexión del demonio al estancar el proceso de handshake antes o después de la selección de módulos sin activar el tiempo de espera de E/S. Los atacantes pueden abrir muchas conexiones simultáneas y enviar datos a la velocidad mínima para evitar el tiempo de espera, o estancarse completamente antes de la selección de módulos donde no se aplica ningún tiempo de espera, consumiendo todas las ranuras de conexión disponibles y denegando el servicio a clientes legítimos. Title: rsync de RsyncProject, Description: El demonio rsync 2.0.0 anterior a 3.5.0 contiene una vulnerabilidad de denegación de servicio que permite a atacantes remotos no autenticados agotar las ranuras de conexión del demonio al estancar el proceso de handshake antes o después de la selección de módulos sin activar el tiempo de espera de E/S. Los atacantes pueden abrir muchas conexiones simultáneas y enviar datos a la velocidad mínima para evitar el tiempo de espera, o estancarse completamente antes de la selección de módulos donde no se aplica ningún tiempo de espera, consumiendo todas las ranuras de conexión disponibles y denegando el servicio a clientes legítimos. -
CVE Translated by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Added Translation Title: rsync de RsyncProject, Description: El demonio rsync 2.0.0 anterior a 3.5.0 contiene una vulnerabilidad de denegación de servicio que permite a atacantes remotos no autenticados agotar las ranuras de conexión del demonio al estancar el proceso de handshake antes o después de la selección de módulos sin activar el tiempo de espera de E/S. Los atacantes pueden abrir muchas conexiones simultáneas y enviar datos a la velocidad mínima para evitar el tiempo de espera, o estancarse completamente antes de la selección de módulos donde no se aplica ningún tiempo de espera, consumiendo todas las ranuras de conexión disponibles y denegando el servicio a clientes legítimos. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 14, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-70464', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-08-14T15:51:09.213016Z'} -
New CVE Received by [email protected]
Aug. 13, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/RsyncProject/rsync', 'vendor': 'RsyncProject', 'product': 'rsync', 'versions': [{'status': 'affected', 'version': '2.0.0', 'versionType': 'semver', 'lessThanOrEqual': '3.4.4'}, {'status': 'unaffected', 'version': '3.5.0', 'versionType': 'semver'}], 'packageURL': 'pkg:github/RsyncProject/rsync', 'defaultStatus': 'unaffected'}] Added Description rsync daemon 2.0.0 before 3.5.0 contains a denial of service vulnerability that allows unauthenticated remote attackers to exhaust daemon connection slots by stalling the handshake process before or after module selection without triggering the I/O timeout. Attackers can open many simultaneous connections and trickle data at the minimum rate to avoid timeout, or stall entirely before module selection where no timeout applies, consuming all available connection slots and denying service to legitimate clients. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/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:N/S:U/C:N/I:N/A:H Added CWE CWE-770 Added Reference https://github.com/RsyncProject/rsync/releases/tag/v3.5.0 Added Reference https://github.com/RsyncProject/rsync/security/advisories/GHSA-hrwq-ccf7-rw5m Added Reference https://www.vulncheck.com/advisories/rsync-connection-slot-exhaustion-dos-via-handshake-stall