CVE-2026-70456
Description
A flaw was found in rsync. A remote attacker could exploit an out-of-bounds write vulnerability in the read_args() function by sending a specially crafted argument list. This could lead to corruption of adjacent memory, potentially causing a denial of service or, in some cases, arbitrary code execution.
Statement
This is an Important severity flaw in rsync, allowing a remote attacker to corrupt heap memory via a specially crafted argument list. The vulnerability, exploitable without authentication or user interaction, could lead to denial of service or potentially arbitrary code execution, elevating its impact beyond Moderate due to the remote, unauthenticated nature of the attack.
Mitigation
To mitigate this issue, restrict network access to rsync services to trusted hosts and networks using firewall rules. If rsync is used in daemon mode, configure `rsyncd.conf` to limit access. When using rsync as a client, avoid synchronizing with untrusted rsync servers.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 8.2 | N/A | 8.2 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
Frequently Asked Questions
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