Skip to main content

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
Share

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
Red Hat
4.8 MEDIUM
qualitative

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

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. No public exploit code and no CISA KEV listing are identified at time of analysis; rsync 3.5.0 was designated a major security release to address this issue.

Technical ContextAI

rsync uses a pipe-based, line-oriented protocol to exchange uid/gid name mappings between the daemon and its name-converter subprocess. CWE-93 (Improper Neutralization of CRLF Sequences / Newline Injection) is the root-cause class: the name-converter interface does not sanitize user or group names for embedded newline characters before serialising them into protocol messages. Because the protocol treats newlines as field or record delimiters, an injected newline causes the parser to treat the remainder of the crafted name as a new, independent protocol directive under attacker control. The vulnerability is present in all rsync releases tracked by CPE cpe:2.3:a:rsyncproject:rsync:*:*:*:*:*:*:*:* prior to version 3.5.0.

RemediationAI

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. Where an immediate upgrade is not possible, administrators should restrict the ability to create or modify OS user and group accounts on systems running rsync daemons to the minimum necessary principals, and audit existing account names for embedded newline or control characters using a command such as 'getent passwd | awk -F: "NF && $1 ~ /[\n\r]/"'. If the name-converter uid/gid mapping feature can be disabled in the rsync daemon configuration without breaking operational requirements, doing so eliminates the vulnerable code path entirely, though this will prevent uid/gid name translation in cross-system sync operations.

More in Rsync

View all
CVE-2024-12085 HIGH POC
7.5 Jan 14

A flaw was found in rsync which could be triggered when rsync compares file checksums. Rated high severity (CVSS 7.5), t

CVE-2024-12084 CRITICAL POC
9.8 Jan 15

A heap-based buffer overflow flaw was found in the rsync daemon. Rated critical severity (CVSS 9.8), this vulnerability

CVE-2014-9512 MEDIUM POC
6.4 Feb 12

rsync 3.1.1 allows remote attackers to write to arbitrary files via a symlink attack on a file in the synchronization pa

CVE-2024-12087 HIGH POC
7.5 Jan 14

Server-to-client path traversal in rsync lets a malicious or compromised rsync server write files outside the client's i

CVE-2022-29154 HIGH POC
7.4 Aug 02

An issue was discovered in rsync before 3.2.5 that allows malicious remote servers to write arbitrary files inside the d

CVE-2014-2855 HIGH
7.8 Apr 23

The check_secret function in authenticate.c in rsync 3.1.0 and earlier allows remote attackers to cause a denial of serv

CVE-2024-12086 MEDIUM POC
6.8 Jan 14

A flaw was found in rsync. Rated medium severity (CVSS 6.1), this vulnerability is remotely exploitable, no authenticati

CVE-2017-16548 CRITICAL
9.8 Nov 06

The receive_xattr function in xattrs.c in rsync 3.1.2 and 3.1.3-development does not check for a trailing '\0' character

CVE-2017-17434 CRITICAL
9.8 Dec 06

The daemon in rsync 3.1.2, and 3.1.3-development before 2017-12-03, does not check for fnamecmp filenames in the daemon_

CVE-2017-15994 CRITICAL
9.8 Oct 29

rsync 3.1.3-development before 2017-10-24 mishandles archaic checksums, which makes it easier for remote attackers to by

CVE-2026-53790 CRITICAL
9.2 Aug 13

Arbitrary command execution in rsync before 3.5.0 arises from multiple unsanitized code paths - the RSYNC_CONNECT_PROG e

CVE-2026-70460 CRITICAL
9.2 Aug 13

Arbitrary file write in rsync 2.3.3 through 3.4.4 lets a malicious sender escape a daemon module's root by abusing symli

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

Share

CVE-2026-53788 vulnerability details – vuln.today

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy