High 7.5Published Aug 13, 2026

CVE-2026-70453rsync < 3.5.0 Algorithmic Complexity DoS via hash_search()

Updated under an hour ago (2026-10-19 07:30 UTC)

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It affects RsyncProject rsync. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for RsyncProject rsync

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-407
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Aug 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

RsyncProject rsync rsyncproject:rsync (from the name)	through 3.4.4; 3.5.0 not affected	CNA record

References

https://github.com/RsyncProject/rsync/security/advisories/GHSA-8x5r-mjx8-83hvvendor-advisory
https://github.com/RsyncProject/rsync/releases/tag/v3.5.0release-notes
https://www.vulncheck.com/advisories/rsync-algorithmic-complexity-dos-via-hash-searchthird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.