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TI-2026-23333 Aliases CVE-2026-29518GHSA-pfv9-gp3h-73xv

Rsync < 3.4.3 TOCTOU Race Condition Allows Symlink-Based Arbitrary File Write

Priority LOW 33CWE-367Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 7 fixed, 4 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00152 4th percentileScored 2026-11-07
Fix Partial rsync (RsyncProject): 3.4.3Red Hat: 5 advisoriesRed Hat: 7 fixed, 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Sambarsyncbefore 3.4.33.4.3Patch availableCNA
  • rsync VendorSamba Affected before 3.4.3 Fixed in 3.4.3 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*before 3.4.3VulnerableSamba
  • cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:* Versions before 3.4.3 Vulnerable ·Samba

Remediation

  • Fix · CNA rsync (RsyncProject) Fixed in 3.4.3

Red Hat 5 advisories

  • RHSA-2026:54769 Released 2026-08-18 · Red Hat rating Important
    OpenShift Container Platform 4.22.10 bug fix and security update
    • Red Hat OpenShift Container Platform 4.22 rhcos-aarch64-4.22.9.8.202608130832-0, rhcos-ppc64le-4.22.9.8.202608130832-0, rhcos-s390x-4.22.9.8.202608130832-0 +1
  • RHSA-2026:29197 Released 2026-06-24 · Red Hat rating Important
    A Subscription Management tool for finding and reporting Red Hat product usage
    • Red Hat Discovery 2 registry.redhat.io/discovery/discovery-server-rhel9, registry.redhat.io/discovery/discovery-ui-rhel9
  • RHSA-2026:26410 Released 2026-06-16 · Red Hat rating Important
    rsync security update
    • Red Hat Enterprise Linux AppStream (v. 9) rsync-daemon-3.2.5-7.el9_8.2, rsync-rrsync-3.2.5-7.el9_8.2
    • Red Hat Enterprise Linux BaseOS (v. 9) rsync-3.2.5-7.el9_8.2
Show 2 more Red Hat advisories
  • RHSA-2026:26408 Released 2026-06-16 · Red Hat rating Important
    rsync security update
    • Red Hat Enterprise Linux BaseOS (v. 8) rsync-3.1.3-27.el8_10, rsync-daemon-3.1.3-27.el8_10
  • RHSA-2026:26332 Released 2026-06-16 · Red Hat rating Important
    rsync security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) rsync-daemon-3.4.4-1.el10_2, rsync-rrsync-3.4.4-1.el10_2
    • Red Hat Enterprise Linux BaseOS (v. 10) rsync-3.4.4-1.el10_2

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    RsyncProject rsync 3.4.3

    6 records Highest priority Priority LOW 6 LOW

    Other records, highest priority first

    • TI-2026-31724 Rsync < 3.4.3 Symlink Race Condition via Path-Based SyscallsPriority LOW 33
    • TI-2026-31725 Rsync < 3.4.3 Out-of-Bounds Array Read via recv_files()Priority LOW 31
    • TI-2026-31723 Rsync < 3.4.3 Integer Overflow Information DisclosurePriority LOW 31
    Show all 6 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix yet
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat OpenShift Container Platform 4AffectedNo fix yet
Red Hat OpenShift Container Platform 5AffectedNo fix yet
Red Hat Discovery 2Fixed RHSA-2026:29197
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:26332
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:26410
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:26332
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:26408
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:26410
Red Hat OpenShift Container Platform 4.22Fixed RHSA-2026:54769
Not affected: 1 product
  • Red Hat Discovery 2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-29518
  2. 2026-10-03 Alias added: GHSA-pfv9-gp3h-73xv
  3. 2026-11-05 Affected versions changed · Red Hat

References

Patch 1

Other 2

  • TI-2024-11208 Rsync: heap buffer overflow in rsync due to improper checksum length handling CVSS 3.1CRITICAL 9.8
  • TI-2024-11209 Rsync: info leak via uninitialized stack contents CVSS 3.1HIGH 7.5
  • TI-2024-11212 Rsync: --safe-links option bypass leads to path traversal CVSS 3.1HIGH 7.5
  • TI-2024-11211 Rsync: path traversal vulnerability in rsync CVSS 3.1HIGH 7.5
  • TI-2024-11210 Rsync: rsync server leaks arbitrary client files CVSS 3.1MEDIUM 6.8
  • TI-2017-12160 The receive_xattr function in xattrs.c in rsync 3.1.2 and 3.1.3-development does not… CVSS 3.1CRITICAL 9.8
See all 56 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences