CVE-2026-119741
rsync through 3.5.1 Denial of Service via hash_search() Checksum Collisions
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
rsync through 3.5.1 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.
| CWE | CWE-407 |
| Vendor | rsyncproject |
| Product | rsync |
| Published | Nov 3, 2026 |
| Last Updated | Nov 3, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
RsyncProject / rsync
0 ≤ 3.5.1
References
github.com: https://github.com/RsyncProject/rsync/pull/1132 github.com: https://github.com/RsyncProject/rsync/commit/a7404a9a633cff28ee1602f328b9c3fa69cdbd04 github.com: https://github.com/RsyncProject/rsync github.com: https://github.com/RsyncProject/rsync/blob/a7404a9a633cff28ee1602f328b9c3fa69cdbd04/testsuite/hashsearch-collision-skip_test.py vulncheck.com: https://www.vulncheck.com/advisories/rsync-through-3.5.1-denial-of-service-via-hash-search-checksum-collisions
Credits
Omar Elsayed Omar Elsayed