CVE-2026-53793Network attack vectorHinoki check available

Unauthorized file access via unconstrained path resolution

Published Aug 13, 2026 · Updated Aug 13, 2026

Path confinement bypass in Rsync Project rsync 3.4.4 and earlier allows remote attackers to read or write files outside a transfer root. The generator, receiver, and pull-client delta-basis logic resolve symlinked parent components or peer-controlled xname paths without enforcing the inner-module or destination boundary. Exploitation requires a chrooted /./ inner module with a controllable parent symlink, or a malicious server supplying a crafted xname during a pull.

CVSS severity9.1
Critical
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Path confinement bypass in Rsync Project rsync 3.4.4 and earlier allows remote attackers to read or write files outside a transfer root. The generator, receiver, and pull-client delta-basis logic resolve symlinked parent components or peer-controlled xname paths without enforcing the inner-module or destination boundary. Exploitation requires a chrooted /./ inner module with a controllable parent symlink, or a malicious server supplying a crafted xname during a pull.

The record

CVE
CVE-2026-53793
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Rsync Project
Product
rsync
Classifications
CWE-59, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 13, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rsync Project · rsyncversion=0 <=3.4.4

Published CVSS scores

9.1VulnCheckCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
7.4VulnCheckCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-59Improper Link Resolution Before File Access ('Link Following')
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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