CVE-2026-53793: rsync < 3.5.0 Path Confinement Bypass via /./ Boundary Marker in Chroot Mode
CSIRTS triage
- What
- The /./ boundary marker in chroot mode can be bypassed to escape the confined directory.
- Who is affected
- Deployments of rsync versions before 3.5.0 using chroot mode are affected.
- Urgency
- High severity (CVSS 7.4) with no current public exploitation; patch should be prioritized.
- 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-2026-53793
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-2026-537930.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-53793 | coverage & exploitation status | NVD · CVE.org |
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