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rsync CVE-2026-53788

| EUVDEUVD-2026-58096 MEDIUM
Improper Neutralization of CRLF Sequences ('CRLF Injection') (CWE-93)
2026-08-13 VulnCheck
6.9
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.9 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/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
vuln.today AI
5.2 MEDIUM

Creating OS accounts with malicious names requires local authenticated access (AV:L, PR:L); scope changes because the daemon parses injected data (S:C); no availability impact.

3.1 AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
SUSE
5.4 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 13, 2026 - 16:08 vuln.today
Analysis Generated
Aug 13, 2026 - 16:08 vuln.today
CVE Published
Aug 13, 2026 - 14:36 cve.org
MEDIUM 6.9

DescriptionCVE.org

rsync before 3.5.0 contains a newline injection vulnerability in the name-converter uid/gid mapping interface that allows local attackers to forge protocol messages by creating user or group names containing newline characters. Attackers can inject malicious newline characters into names communicated over the pipe-based line-oriented protocol to cause the rsync daemon to process attacker-influenced data as legitimate protocol input, corrupting uid/gid mapping logic.

AnalysisAI

Newline injection in rsync's name-converter uid/gid mapping interface (all versions before 3.5.0) allows local attackers to forge protocol messages by embedding newline characters in OS-level user or group names. Because the rsync daemon communicates with the name-converter over a pipe-based, line-oriented protocol, injected newlines create false protocol boundaries, causing the daemon to parse attacker-controlled strings as legitimate protocol directives and corrupting uid/gid mapping logic. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Recon
Gain local OS privileges sufficient to create accounts
Delivery
Create user or group name with embedded newline characters
Exploit
Trigger rsync daemon uid/gid name-converter mapping operation
Install
Malicious name written to pipe protocol
C2
Daemon parses injected newline as protocol boundary
Execute
Attacker-controlled string processed as legitimate protocol directive
Impact
uid/gid mapping logic corrupted, file ownership manipulated

Vulnerability AssessmentAI

Exploitation Exploitation requires local operating system access with the privilege to create or modify a user or group account with newline characters embedded in the name, which on standard Linux/Unix systems requires root or equivalent elevated privileges. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The supplied CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N, score 6.9) presents a notable conflict with the CVE description, which explicitly scopes the attack to 'local attackers' - the mismatch on AV and PR is significant and defenders should verify the actual attack surface with the vendor before drawing conclusions about remote or unauthenticated exploitability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A local attacker with sufficient OS privileges to create a user account crafts a username containing an embedded newline character - for example, a name of the form 'user\nINJECTED_DIRECTIVE'. When the rsync daemon invokes the name-converter subprocess for uid/gid mapping, this name is written to the pipe in line-oriented protocol format, causing the daemon to parse 'INJECTED_DIRECTIVE' as a separate protocol message, allowing the attacker to influence the daemon's uid/gid mapping decisions and potentially manipulate file ownership outcomes during sync operations. …
Remediation The primary fix is upgrading to rsync 3.5.0, confirmed as a major security release by the official GitHub release tag (https://github.com/RsyncProject/rsync/releases/tag/v3.5.0) and the full changelog at https://download.samba.org/pub/rsync/NEWS#3.5.0; the vendor security advisory at https://github.com/RsyncProject/rsync/security/advisories/GHSA-p4c5-8c68-5fjq should be reviewed for any additional guidance. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected
SUSE Linux Enterprise Micro 5.3 Affected

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CVE-2026-53788 vulnerability details – vuln.today

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