CVE-2026-44508Network attack vector

Process-memory disclosure via signed counter overflow

Published Jul 20, 2026 · Updated Jul 20, 2026

Integer overflow in rsync before 3.4.3 allows remote authenticated users acting as senders to read receiver process memory. The compressed-token decoder adds token lengths to a 32-bit signed counter without checking for overflow, causing reads beyond the intended buffer. Exploitation requires a compressed transfer to the receiver and exposes heap, stack, library, environment, password, and pointer data.

CVSS severity8.1
High
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Integer overflow in rsync before 3.4.3 allows remote authenticated users acting as senders to read receiver process memory. The compressed-token decoder adds token lengths to a 32-bit signed counter without checking for overflow, causing reads beyond the intended buffer. Exploitation requires a compressed transfer to the receiver and exposes heap, stack, library, environment, password, and pointer data.

The record

CVE
CVE-2026-44508
Published
Jul 20, 2026
Updated
Jul 20, 2026
Vendor
Rsync Project
Product
rsync
Classifications
CWE-190, CWE-200, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 20, 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=< 3.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Rsync Project · rsyncversion=< 3.4.3

Published CVSS scores

8.1RsyncProjectCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application

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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