Bug 2515403 (CVE-2026-70453) - CVE-2026-70453 rsync: rsync: Denial of Service via Algorithmic Complexity
Summary: CVE-2026-70453 rsync: rsync: Denial of Service via Algorithmic Complexity
Keywords:
Status: NEW
Alias: CVE-2026-70453
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2519581 2519582 2519583
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-13 15:51 UTC by OSIDB Bzimport
Modified: 2026-08-26 13:03 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

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Description OSIDB Bzimport 2026-08-13 15:51:37 UTC 
rsync before 3.5.0 contains an algorithmic complexity vulnerability in the hash_search() function that allows a remote attacker to cause a denial of service by delivering a carefully constructed file list. A sender can exploit the quadratic-time worst-case behavior in hash lookups to exhaust receiver CPU resources with a modest number of crafted entries, causing a sustained denial of service.
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