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TI-2026-38779 Aliases CVE-2026-53783

rsync < 3.5.0 TOCTOU Race Condition Directory Escape via rrsync

Priority MEDIUM 40CWE-59Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · None
Fix status
Partial Red Hat: 6 fixed, 2 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-88.

Summary

rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync restricted shell wrapper that allows authenticated clients to escape enforced directory restrictions by substituting a symlink for a path component after validation but before transfer processing. Attackers can additionally leverage unrestricted flags such as --copy-unsafe-links, -D, and --log-file through rrsync to read or write files outside the permitted directory subtree.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00428 37th percentileScored 2026-11-07
Fix Partial rsync (RsyncProject): 3.5.0Red Hat: 4 advisoriesRed Hat: 6 fixed, 2 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
Sambarsyncup to 3.4.43.5.0Patch availableCNA
  • rsync VendorSamba Affected up to 3.4.4 Fixed in 3.5.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*before 3.5.0VulnerableSamba
  • cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:* Versions before 3.5.0 Vulnerable ·Samba

Remediation

  • Fix · CNA rsync (RsyncProject) Fixed in 3.5.0

Red Hat 4 advisories

  • RHSA-2026:79357 Released 2026-10-08 · Red Hat rating Important
    Red Hat Cost Management On-Premise container image update
    • Red Hat Cost Management On-Premise 1 registry.redhat.io/costmanagement/costmanagement-ui-rhel10
  • RHSA-2026:74095 Released 2026-09-30 · Red Hat rating Important
    rsync security, bug fix, and enhancement update
    • Red Hat Enterprise Linux BaseOS (v. 8) rsync-3.1.3-28.el8_10, rsync-daemon-3.1.3-28.el8_10
  • RHSA-2026:67462 Released 2026-09-14 · Red Hat rating Important
    rsync security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 9) rsync-daemon-3.2.7-1.el9_8, rsync-rrsync-3.2.7-1.el9_8
    • Red Hat Enterprise Linux BaseOS (v. 9) rsync-3.2.7-1.el9_8
Show 1 more Red Hat advisories
  • RHSA-2026:67463 Released 2026-09-14 · Red Hat rating Important
    rsync security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 10) rsync-daemon-3.5.0-3.el10_2, rsync-rrsync-3.5.0-3.el10_2
    • Red Hat Enterprise Linux BaseOS (v. 10) rsync-3.5.0-3.el10_2

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 Cost Management On-Premise 1Fixed RHSA-2026:79357
Red Hat Enterprise Linux AppStream (v. 10)Fixed RHSA-2026:67463
Red Hat Enterprise Linux AppStream (v. 9)Fixed RHSA-2026:67462
Red Hat Enterprise Linux BaseOS (v. 10)Fixed RHSA-2026:67463
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2026:74095
Red Hat Enterprise Linux BaseOS (v. 9)Fixed RHSA-2026:67462
Not affected: 2 products
  • Red Hat OpenShift Container Platform 4
  • Red Hat OpenShift Container Platform 5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-53783
  2. 2026-10-09 Fix available: RHSA-2026:79357 · Red Hat
  3. 2026-10-09 Fix available: Red Hat Cost Management On-Premise 1 · Red Hat
  4. 2026-11-05 Affected versions changed · Red Hat
  5. 2026-11-08 Priority changed: LOW → MEDIUM

References

Advisory 1

Other 1

  • 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