Vulnerability Description
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 Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/RsyncProject/rsync/releases/tag/v3.5.0
- https://github.com/RsyncProject/rsync/security/advisories/GHSA-8x5r-mjx8-83hv
- https://www.vulncheck.com/advisories/rsync-algorithmic-complexity-dos-via-hash-s
FAQ
What is CVE-2026-70453?
CVE-2026-70453 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...
How severe is CVE-2026-70453?
CVE-2026-70453 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-70453?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.