CVE-2026-43619
Rsync < 3.4.3 Symlink Race Condition via Path-Based Syscalls
Description
Rsync version 3.4.2 and prior contain symlink race condition vulnerabilities in path-based system calls including chmod, lchown, utimes, rename, unlink, mkdir, symlink, mknod, link, rmdir, and lstat that allow local attackers to redirect operations to files outside the exported rsync module. Attackers with local filesystem access can exploit the timing window between path resolution and syscall execution by swapping symlinks to apply sender-supplied permissions, ownership, timestamps, or filenames to arbitrary files outside the intended module boundary on rsync daemons configured with 'use chroot = no'.
INFO
Published Date :
May 20, 2026, 2:16 a.m.
Last Modified :
May 21, 2026, 8:42 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 4.0 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Rsync to a patched version.
- Configure Rsync daemon with 'use chroot = yes'.
- Limit module access to trusted sources.
- Monitor for suspicious file modifications.
Public PoC/Exploit Available at Github
CVE-2026-43619 has a 2 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-43619.
| URL | Resource |
|---|---|
| https://github.com/RsyncProject/rsync/releases/tag/v3.4.3 | Release Notes |
| https://github.com/RsyncProject/rsync/security/advisories/GHSA-4h9m-w5ff-j735 | Vendor Advisory |
| https://www.vulncheck.com/advisories/rsync-symlink-race-condition-via-path-based-syscalls | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43619 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43619
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
None
Shell
Classic rsync re-implementation in pure Rust
Rust Shell Python Ruby Makefile Dockerfile RenderScript C
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-43619 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43619 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 21, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:* versions up to (including) 3.4.2 Added Reference Type VulnCheck: https://github.com/RsyncProject/rsync/releases/tag/v3.4.3 Types: Release Notes Added Reference Type VulnCheck: https://github.com/RsyncProject/rsync/security/advisories/GHSA-4h9m-w5ff-j735 Types: Vendor Advisory Added Reference Type VulnCheck: https://www.vulncheck.com/advisories/rsync-symlink-race-condition-via-path-based-syscalls Types: Third Party Advisory -
New CVE Received by [email protected]
May. 20, 2026
Action Type Old Value New Value Added Description Rsync version 3.4.2 and prior contain symlink race condition vulnerabilities in path-based system calls including chmod, lchown, utimes, rename, unlink, mkdir, symlink, mknod, link, rmdir, and lstat that allow local attackers to redirect operations to files outside the exported rsync module. Attackers with local filesystem access can exploit the timing window between path resolution and syscall execution by swapping symlinks to apply sender-supplied permissions, ownership, timestamps, or filenames to arbitrary files outside the intended module boundary on rsync daemons configured with 'use chroot = no'. Added CVSS V4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N Added CWE CWE-59 Added CWE CWE-367 Added Reference https://github.com/RsyncProject/rsync/releases/tag/v3.4.3 Added Reference https://github.com/RsyncProject/rsync/security/advisories/GHSA-4h9m-w5ff-j735 Added Reference https://www.vulncheck.com/advisories/rsync-symlink-race-condition-via-path-based-syscalls