CVE-2026-70453
published 2026-08-13CVE-2026-70453: 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…
PriorityP342high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.53%
42.6th percentile
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.
Affected
2 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| rsyncproject | rsync | <= 3.4.4 | — |
| samba | rsync | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv4.08.7HIGHCVSS: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
vendor_redhat7.5HIGH
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Bugzilla
CVE-2026-70453 rsync: rsync: Denial of Service via Algorithmic Complexity [fedora-all]
bugzilla·2026-08-19·CVSS 7.5
CVE-2026-70453 [HIGH] CVE-2026-70453 rsync: rsync: Denial of Service via Algorithmic Complexity [fedora-all]
CVE-2026-70453 rsync: rsync: Denial of Service via Algorithmic Complexity [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-70453 rsync-bpc: rsync: Denial of Service via Algorithmic Complexity [fedora-all]
bugzilla·2026-08-19·CVSS 7.5
CVE-2026-70453 [HIGH] CVE-2026-70453 rsync-bpc: rsync: Denial of Service via Algorithmic Complexity [fedora-all]
CVE-2026-70453 rsync-bpc: rsync: Denial of Service via Algorithmic Complexity [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-70453 rsync-bpc: rsync: Denial of Service via Algorithmic Complexity [epel-all]
bugzilla·2026-08-19·CVSS 7.5
CVE-2026-70453 [HIGH] CVE-2026-70453 rsync-bpc: rsync: Denial of Service via Algorithmic Complexity [epel-all]
CVE-2026-70453 rsync-bpc: rsync: Denial of Service via Algorithmic Complexity [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-70453 rsync: rsync: Denial of Service via Algorithmic Complexity
bugzilla·2026-08-13·CVSS 7.5
CVE-2026-70453 [HIGH] CVE-2026-70453 rsync: rsync: Denial of Service via Algorithmic Complexity
CVE-2026-70453 rsync: rsync: Denial of Service via Algorithmic Complexity
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.
2026-08-13
Published