CVE-2026-53794

Summary

rsync before 3.5.0 contains a logic error in –max-alloc handling that allows a sender or configuration setting –max-alloc=0 to disable allocation sanity checks entirely rather than enforcing a zero-byte cap. Attackers can exploit this flaw to cause the receiver to attempt unbounded memory allocations for file list and data structures, potentially exhausting available memory and causing a denial of service.

Affected Software

Weaknesses

• CWE-1284: CWE-1284 Improper Validation of Specified Quantity in Input

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

• https://github.com/RsyncProject/rsync/security/advisories/GHSA-p827-vwcp-m964
• https://github.com/RsyncProject/rsync/releases/tag/v3.5.0
• https://www.vulncheck.com/advisories/rsync-denial-of-service-via-max-alloc-0-logic-error

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