CVE-2026-29518 (GCVE-0-2026-29518)

Vulnerability from cvelistv5 – Published: 2026-05-20 12:48 – Updated: 2026-08-25 12:05 X_Open Source
VLAI
Title
Rsync < 3.4.3 TOCTOU Race Condition Allows Symlink-Based Arbitrary File Write
Summary
Rsync versions before 3.4.3 contain a time-of-check to time-of-use (TOCTOU) race condition in daemon file handling that allows attackers to redirect file writes outside intended directories by replacing parent directory components with symbolic links. Attackers with write access to a module path can exploit this race condition to create or overwrite arbitrary files, potentially modifying sensitive system files and achieving privilege escalation when the daemon runs with elevated privileges. This vulnerability can only be triggered if the chroot setting is false.
Severity
7.3 (High)
CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-20 14:50 UTC
CWE
  • CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
Impacted products
Vendor Product Version CPE status
RsyncProject rsync Affected: 0 , < 3.4.3 (semver)
    cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*
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Red Hat Red Hat Enterprise Linux 10 Unaffected: 0:3.4.4-1.el10_2 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux 8 Unaffected: 0:3.1.3-27.el8_10 , < * (rpm)
    cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat Enterprise Linux 9 Unaffected: 0:3.2.5-7.el9_8.2 , < * (rpm)
    cpe:/a:redhat:enterprise_linux:9
    cpe:/o:redhat:enterprise_linux:9
Create a notification for this product.
Red Hat Red Hat OpenShift Container Platform 4.22 Unaffected: 4.22.9.8.202608130832-0 , < * (rpm)
    cpe:/a:redhat:openshift:4.22::el9
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Red Hat Red Hat Discovery 2 Unaffected: 1782166952 , < * (rpm)
    cpe:/a:redhat:discovery:2::el9
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Date Public
2026-05-19 00:00
Credits
Nullx3D (Batuhan SANCAK) Michael Stapelberg Damien Neil
Show details on NVD website
To clipboard 

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      "product_status:fixed": "50",
      "product_status:known_affected": "4",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.