CVE-2026-53788
Description
A newline injection vulnerability exists in rsync's uid/gid mapping process. An attacker can inject newline characters into user or group names, causing the rsync daemon to process attacker-controlled data as legitimate protocol input. This results in data corruption within the uid/gid mapping logic.
Statement
A Moderate severity vulnerability in rsync allows an unauthenticated, remote attacker to inject newline characters into user or group names. Under highly complex conditions, this injection forces rsync to process forged protocol messages, leading to limited data corruption within the uid/gid mapping logic.
Mitigation
Do not set name converter in rsyncd.conf unless you need chroot uid/gid lookups. Restrict rsyncd (TCP 873) to trusted clients; if the daemon is unused, disable rsyncd.service. If a converter is required, keep it on a trusted network
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 | 4.8 | N/A | 6.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Application Data
Frequently Asked Questions
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