CVE-2026-70456Network attack vector

Daemon heap corruption via full argument allocation

Published Aug 13, 2026 · Updated Aug 13, 2026

Out-of-bounds write in rsync 3.0.1 through 3.4.4 allows remote attackers to corrupt heap memory through a crafted daemon request. In read_args(), glob expansion can make argc equal maxargs, and the code then stores the trailing NULL pointer one slot beyond the argv allocation. A remote daemon client must hit the exact argument boundary; the overwrite threatens the connection worker's availability and processing integrity, with no reported data disclosure.

CVSS severity8.8
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in rsync 3.0.1 through 3.4.4 allows remote attackers to corrupt heap memory through a crafted daemon request. In read_args(), glob expansion can make argc equal maxargs, and the code then stores the trailing NULL pointer one slot beyond the argv allocation. A remote daemon client must hit the exact argument boundary; the overwrite threatens the connection worker's availability and processing integrity, with no reported data disclosure.

The record

CVE
CVE-2026-70456
Published
Aug 13, 2026
Updated
Aug 13, 2026
Vendor
Rsync Project
Product
rsync
Classifications
CWE-787, T1190
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=3.0.1 <=3.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rsync Project · rsyncversion=3.0.1 <=3.4.4

Published CVSS scores

8.8VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
8.2GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

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-787Out-of-bounds Write
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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