CVE-2026-70455: rsync 3.4.2 < 3.5.0 DoS via --zt Zstandard Compression Thread Exhaustion
RsyncProject · rsync
Fixed in 3.5.0 · Affected: RsyncProject before 3.5.0 · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 47% of scored CVEs
DescriptionCVE.org
rsync 3.4.2 before 3.5.0 contains a denial of service vulnerability that allows a remote sender to exhaust system resources by specifying the --zt short alias for --compress-threads, which bypasses the refuse options directive's string matching on long option names. Attackers can specify --zt=N with a large value to spawn an unbounded number of Zstandard worker threads on the receiver, exhausting available thread and memory resources.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- RsyncProject · rsyncfrom 3.4.2 up to and including 3.4.4
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- RsyncProject
- Published
- August 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-70455 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.