CVE-2026-53790: rsync < 3.5.0 Command Injection via Multiple Code Paths
CSIRTS triage
- What
- Command injection via multiple code paths allows arbitrary command execution in rsync.
- Who is affected
- rsync versions below 3.5.0 are affected.
- Urgency
- High urgency with CVSS 8.1; command injection is a critical vulnerability requiring immediate remediation.
- Action
- Upgrade rsync to version 3.5.0 or later.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53790
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-537900.52% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-53790 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
Recent advisories for rsync <
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- high[NEW] [high] Rsync: Multiple vulnerabilitiescert-bund · 2026-08-21
- high[UPDATE] [high] Rsync: Multiple vulnerabilitiescert-bund · 2026-08-19
- medium[UPDATE] [medium] Rsync: Vulnerability allows bypassing security measurescert-bund · 2026-08-18
- highCVE-2026-70464: rsync daemon 2.0.0 before 3.5.0 contains a denial of service vulnerability that allows unauthe…nvd · 2026-08-13
- highCVE-2026-70463: rsync 3.1.0 before 3.5.0 contains an authorization bypass in auth users directive parsing. The…nvd · 2026-08-13
- mediumCVE-2026-70462: rsync 3.1.0 before 3.5.0 contains a signed integer overflow vulnerability in the I/O timeout i…nvd · 2026-08-13
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