Security readout for executives and security teams
Plain-English summary
Rsync versions before 3.5.0 can treat malicious connection details as commands. If attacker-controlled hostnames, host specifications, or related settings reach vulnerable paths, arbitrary commands may run with the rsync process or invoking user’s privileges, risking data theft, alteration, and service disruption.
Executive priority
Begin urgent inventory and remediation. Prioritize exposed or privileged automation because successful exploitation could compromise confidentiality, integrity, and availability. The absence of KEV listing does not remove risk, but active exploitation is not established by the supplied evidence.
Technical view
Multiple CWE-78 and CWE-88 flaws affect command construction in RSYNC_CONNECT_PROG, daemon hooks, the rsync-ssl wrapper, and remote-shell handling. Unsanitized shell metacharacters or newline characters in hostnames and hostspecs can cause command execution. The supplied CVSS 4.0 score is 9.2, with network reachability but high attack complexity.
Likely exposure
Exposure is highest where rsync before 3.5.0 processes untrusted hostnames or hostspecs, uses daemon hooks or rsync-ssl, or permits attacker influence over RSYNC_CONNECT_PROG. Actual reachability depends on deployment configuration, input provenance, and rsync process privileges.
Exploitation context
The supplied record indicates network attackability without authentication or user interaction, but high attack complexity. It is not listed in KEV, and the supplied sources provide no evidence of active exploitation. Treat proof-of-concept availability and observed attacks as unconfirmed.
Researcher notes
The issue spans several command-building boundaries rather than one isolated parser. Validation should map which vulnerable paths are reachable and whether attacker-controlled values cross into them. The supplied version statement says versions before 3.5.0 are affected; precise downstream package status requires distributor confirmation.
Mitigation direction
- Upgrade affected rsync installations to version 3.5.0 or later using trusted vendor packages.
- Prioritize internet-facing, automated, privileged, daemon-mode, and rsync-ssl deployments.
- Prevent untrusted users or upstream systems from controlling hostnames, hostspecs, hooks, or RSYNC_CONNECT_PROG.
- Restrict rsync execution privileges and review vendor guidance for deployment-specific mitigations.
Validation and detection
- Inventory rsync versions across servers, appliances, containers, backup systems, and automation runners.
- Identify workflows where external input influences hostnames, hostspecs, daemon hooks, rsync-ssl, or RSYNC_CONNECT_PROG.
- Confirm upgraded systems report rsync 3.5.0 or later from their trusted package source.
- Review rsync execution identities and investigate unexpected child processes or command activity.
- Retest affected workflows after remediation without using malicious payloads in production.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCWE-88: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-53790 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.2 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H2.25.9VulnCheckVulnerability scoring details
Base CVSS 4.0 score
9.2CriticalVector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- GitHub Security Advisory (GHSA-5hcf-7xxm-rmqq)CVE reference, VulnCheck · vendor-advisory
- rsync 3.5.0 Release NotesCVE reference, VulnCheck · release-notes
- https://www.vulncheck.com/advisories/rsync-command-injection-via-multiple-code-pathsCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.