CVE-2026-53788: CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection') in RsyncProject rsync
A vulnerability in rsync versions up to 3.4.4 allows local attackers to inject newline characters into user or group names used in the uid/gid mapping interface. This newline injection can cause the rsync daemon to misinterpret protocol messages, potentially corrupting the uid/gid mapping logic. The issue is classified as a CRLF injection vulnerability (CWE-93).
AI Analysis
Technical Summary
Rsync versions prior to 3.5.0 contain a newline injection vulnerability in the name-converter uid/gid mapping interface. Local attackers can create user or group names with embedded newline characters, which are then communicated over the pipe-based line-oriented protocol. This allows attackers to forge protocol messages, causing the rsync daemon to process attacker-influenced data as legitimate input, thereby corrupting the uid/gid mapping logic.
Potential Impact
The vulnerability enables local attackers to manipulate protocol messages by injecting newline characters into user or group names. This can corrupt the uid/gid mapping logic within the rsync daemon, potentially leading to incorrect permission mappings or other unintended behavior related to user and group identification during synchronization.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch is currently documented. Users should monitor vendor communications for updates and consider restricting local user permissions to limit exposure until a fix is available.
CVE-2026-53788: CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection') in RsyncProject rsync
Description
A vulnerability in rsync versions up to 3.4.4 allows local attackers to inject newline characters into user or group names used in the uid/gid mapping interface. This newline injection can cause the rsync daemon to misinterpret protocol messages, potentially corrupting the uid/gid mapping logic. The issue is classified as a CRLF injection vulnerability (CWE-93).
CVSS v4.0
Score 6.9medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Rsync versions prior to 3.5.0 contain a newline injection vulnerability in the name-converter uid/gid mapping interface. Local attackers can create user or group names with embedded newline characters, which are then communicated over the pipe-based line-oriented protocol. This allows attackers to forge protocol messages, causing the rsync daemon to process attacker-influenced data as legitimate input, thereby corrupting the uid/gid mapping logic.
Potential Impact
The vulnerability enables local attackers to manipulate protocol messages by injecting newline characters into user or group names. This can corrupt the uid/gid mapping logic within the rsync daemon, potentially leading to incorrect permission mappings or other unintended behavior related to user and group identification during synchronization.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch is currently documented. Users should monitor vendor communications for updates and consider restricting local user permissions to limit exposure until a fix is available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-06-10T20:14:32.827Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7ddec4bf8831d5395cfc88
Added to database: 08/13/2026, 15:12:04 UTC
Last enriched: 08/13/2026, 15:59:10 UTC
Last updated: 08/13/2026, 15:59:10 UTC
Views: 2
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