CVE-2026-70463
rsync auth-users parsing bug lets denied users access restricted modules
Is CVE-2026-70463 being exploited?
Not confirmed. CVE-2026-70463 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.36% probability of exploitation in the next 30 days.
How severe is CVE-2026-70463?
CVE-2026-70463 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-70463?
Yes. A fix has been recorded for CVE-2026-70463. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-70463 affect?
CVE-2026-70463 affects rsync >=3.1.0 and <3.5.0, Unix/Linux servers running rsync daemon. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-70463?
Upgrade rsync to 3.5.0+; remove/rename group names with spaces as interim mitigation
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated users can bypass 'auth users' deny rules when group names contain spaces and gain access to restricted rsync modules.
Patch when possible
- affected>= 3.1.0 and <= 3.4.4
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.