rsync 3.5.2 fixes CPU exhaustion flaw
3.5.2 prevents malicious checksum attacks and adds priority controls.
40
CVE-2026-119741
CPU denial of service in rsync through 3.5.1
- CVSS 4.0
- 8.7 high
- EPSS
- —
- Published
- ·
- Modified
AI analysisSummaries by Vani AI
rsync through 3.5.1 has a denial-of-service flaw in the delta-transfer sender's hash_search() in match.c. An unauthenticated attacker pulling from a public daemon module can send weak checksums that collide with consecutive rolling windows and strong checksums that do not match, forcing unbounded strong-checksum work. That exhausts the sender's CPU across concurrent connections. Hosts offering public rsync daemon modules are affected.
What to do: No fixed version is stated. Apply the rsync update for CVE-2026-119741.
| Product | Affected |
|---|---|
| rsync | through 3.5.1 |
Estimated exposure
No basis for an estimate.
Order-of-magnitude estimate by the model from install counts, market share and public scan data it knows; verify before quoting.
Description · NVD
rsync before 3.5.2 contains a denial of service vulnerability in the delta-transfer sender's hash_search() in match.c that allows malicious receivers to trigger unbounded strong-checksum work at consecutive offsets. Unauthenticated attackers pulling from a public daemon module can supply weak checksums colliding with consecutive rolling windows plus non-matching strong checksums, exhausting sender CPU across concurrent connections.
- Vendors
- samba
- Products
- rsync
- Weakness
- CWE-407
- Vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X